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  1. AU="Mao, Jiangyu"
  2. AU="Solana, Gerardin"
  3. AU="Sill"
  4. AU="Ikler, Graham"
  5. AU="Morris Swertz"
  6. AU="Sato, Hisashi"
  7. AU="O'Rourke, Dennis H"
  8. AU="Ozuna, César"
  9. AU="Vázquez-Carrera, Manuel"
  10. AU="Tanner, Rikki M"
  11. AU="Daniel H Miller"
  12. AU="Madec, Jean-Yves"
  13. AU=Rahimi Mitra

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  1. Artikel: Interannual variations in spring lightning activity and convective rainfall over South China during the TRMM era

    Mao, Jiangyu / Li, Majun

    Theoretical and applied climatology. 2020 Oct., v. 142, no. 1-2

    2020  

    Abstract: The interannual variability of spring lightning activity over South China (SC) and its driving mechanism are examined using the Tropical Rainfall Measuring Mission (TRMM) satellite-estimated convective rain rate and merged lightning flash rate datasets ... ...

    Abstract The interannual variability of spring lightning activity over South China (SC) and its driving mechanism are examined using the Tropical Rainfall Measuring Mission (TRMM) satellite-estimated convective rain rate and merged lightning flash rate datasets together with atmospheric and oceanic reanalysis products over the TRMM period (1998–2014). SC is climatologically characterized by high lightning flash densities, strong convective rainfall, and large convective available potential energy (CAPE) during spring. The spring SC lightning activity (SCLA) has a strong year-to-year variability, and the standard deviation of flash rates shows a spatially coherent annular distribution centered over the Pearl River Delta. The interannual variations of spring SCLA are not only highly correlated with those of convective rainfall and CAPE, but also significantly correlated with El Niño–Southern Oscillation (ENSO). The anomalously frequent SCLA tends to follow El Niño events, while infrequent SCLA preferentially follows La Niña events. Composite analyses demonstrate that during spring for the more frequent SCLA cases, the upper tropospheric atmospheric response to El Niño-related sea surface temperature anomaly (SSTA) patterns leads to strong southwesterlies over SC in conjunction with tropical westerlies over the tropical Indian Ocean, forming a divergent environment over SC. The upper-level divergence is coupled with low-level moisture convergence, generating strong mid-tropospheric updrafts to lift more air parcels to reach their level of free convection, thereby producing stronger convection with frequent SCLA. In contrast, the anomalous circulation forced by La Niña-related SSTA patterns is conducive to suppressed convection over SC and infrequent SCLA.
    Schlagwörter El Nino ; La Nina ; air ; climatology ; convection ; convective available potential energy ; data collection ; lightning ; rain ; river deltas ; rivers ; spring ; standard deviation ; surface water temperature ; troposphere ; China ; Indian Ocean
    Sprache Englisch
    Erscheinungsverlauf 2020-10
    Umfang p. 483-495.
    Erscheinungsort Springer Vienna
    Dokumenttyp Artikel
    Anmerkung NAL-AP-2-clean
    ZDB-ID 1463177-5
    ISSN 1434-4483 ; 0177-798X
    ISSN (online) 1434-4483
    ISSN 0177-798X
    DOI 10.1007/s00704-020-03322-0
    Datenquelle NAL Katalog (AGRICOLA)

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  2. Artikel ; Online: Relative contributions to ENSO of the seasonal footprinting and trade wind charging mechanisms associated with the Victoria mode

    Ji, Kai / Tseng, Yuheng / Ding, Ruiqiang / Mao, Jiangyu / Feng, Licheng

    Clim Dyn. 2023 Jan., v. 60, no. 1-2 p.47-63

    2023  

    Abstract: The Victoria mode (VM), as a basin-scale sea surface temperature (SST) pattern over the North Pacific, is suggested to facilitate subsequent development of El Niño–Southern Oscillation (ENSO) through both the seasonal footprinting mechanism (SFM) and the ...

    Abstract The Victoria mode (VM), as a basin-scale sea surface temperature (SST) pattern over the North Pacific, is suggested to facilitate subsequent development of El Niño–Southern Oscillation (ENSO) through both the seasonal footprinting mechanism (SFM) and the trade wind charging (TWC) mechanism. The present study aims at investigating the distinct roles and relative contributions to ENSO of the SFM and the TWC mechanism associated with the VM using atmospheric and oceanic reanalysis data as well as modeling simulations. Our results reveal that the positive SST anomalies (SSTAs) over the subtropical northeast Pacific (SNP) related to the VM effectively trigger the initiation of ENSO via the SFM, which emphasizes an air–sea surface thermodynamic-coupling process. In contrast, the negative SSTAs over the western North Pacific (WNP) associated with the VM primarily induce ENSO via a thermocline–SST feedback process, known as the TWC mechanism. Further analysis indicates that the SFM related to the VM may play a relatively independent role in affecting ENSO and is more closely linked to ENSO than is the TWC mechanism related to the VM, which is shown to be reasonably reproduced by the Community Earth System Model. Additionally, the SFM associated with the positive (negative) SNP SSTAs may induce fewer El Niño events (more La Niña events) than the TWC mechanism related to the positive (negative) WNP SSTAs. Our findings suggest that the SFM and the TWC mechanism associated with the VM both contribute to enhanced predictive skill for ENSO.
    Schlagwörter Earth system science ; El Nino ; La Nina ; models ; surface water temperature ; trade winds
    Sprache Englisch
    Erscheinungsverlauf 2023-01
    Umfang p. 47-63.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel ; Online
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-022-06300-6
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  3. Artikel: The influence of atmospheric intraseasonal oscillations on terrestrial biospheric CO2 fluxes in Southeast China Forest

    Li, Jianying / Kug, Jong-Seong / Mao, Jiangyu

    Climate dynamics. 2021 July, v. 57, no. 1-2

    2021  

    Abstract: With its strong carbon sequestration capacity and significantly expanding trend, forest over southeast China (SEC) is an important biospheric carbon sink. As intraseasonal oscillation (ISO) is a remarkable variability of the East Asian summer monsoon—the ...

    Abstract With its strong carbon sequestration capacity and significantly expanding trend, forest over southeast China (SEC) is an important biospheric carbon sink. As intraseasonal oscillation (ISO) is a remarkable variability of the East Asian summer monsoon—the major climate system influencing the carbon exchange of SEC forest, the objective of this study is to examine the impact of atmospheric intraseasonal oscillation on CO₂ fluxes in SEC forest based on daily CO₂ fluxes and meteorological data. Significant 15‒60-day ISO of CO₂ fluxes is identified in SEC forest during May‒August of 1980‒2013. The 15‒60-day ISO of net ecosystem exchange between atmosphere and biosphere mainly results from that of gross primary productivity (GPP), with the explained variances greater than 50% over most SEC forest areas. Due to the high drought-resistance of SEC forest, the 15‒60-day ISO of its GPP is controlled primarily by local solar radiation, which is in turn associated with the northward-propagating atmospheric ISO. Suppressed (active) convection anomaly and the thermally induced anomalous anticyclone (cyclone) on its northwestern side initiate from the southern South China Sea and then propagate northward to SEC coherently in the form of a Rossby wave-like pattern. Decreased (increased) cloud cover associated with the suppressed (active) convection anomaly leads to more (less) solar radiation reaching the SEC forest canopy, thus promoting (impairing) forest productivity.
    Schlagwörter biosphere ; carbon ; carbon dioxide ; carbon sequestration ; carbon sinks ; climate ; cloud cover ; convection ; drought tolerance ; dynamics ; forest canopy ; forests ; gross primary productivity ; intraseasonal oscillation ; meteorological data ; net ecosystem exchange ; solar radiation ; summer ; China ; South China Sea
    Sprache Englisch
    Erscheinungsverlauf 2021-07
    Umfang p. 195-208.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-021-05702-2
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  4. Artikel: Factors controlling the interannual variation of 30–60-day boreal summer intraseasonal oscillation over the Asian summer monsoon region

    Li, Jianying / Mao, Jiangyu

    Climate dynamics. 2019 Feb., v. 52, no. 3-4

    2019  

    Abstract: The 30–60-day boreal summer intraseasonal oscillation (BSISO) is a dominant variability of the Asian summer monsoon (ASM), with its intensity being quantified by intraseasonal standard deviations based on OLR data. The spatial and interannual variations ... ...

    Abstract The 30–60-day boreal summer intraseasonal oscillation (BSISO) is a dominant variability of the Asian summer monsoon (ASM), with its intensity being quantified by intraseasonal standard deviations based on OLR data. The spatial and interannual variations of the BSISO intensity are identified via empirical orthogonal function (EOF) analysis for the period 1981–2014. The first EOF mode (EOF1) shows a spatially coherent enhancement or suppression of BSISO activity over the entire ASM region, and the interannual variability of this mode is related to the sea surface temperature anomaly (SSTA) contrast between the central–eastern North Pacific (CNP) and tropical Indian Ocean. In contrast, the second mode (EOF2) exhibits a seesaw pattern between the southeastern equatorial Indian Ocean (EIO) and equatorial western Pacific (EWP), with the interannual fluctuation linked with developing ENSO events. During strong years of EOF1 mode, the enhanced low-level westerlies induced by the summer-mean SSTA contrast between the warmer CNP and cooler tropical Indian Ocean tend to form a wetter moisture background over the eastern EIO, which interacts with intraseasonal low-level convergent flows, leading to stronger equatorial eastward propagation. The intensified easterly shear favors stronger northward propagation over the South Asian and Eastern Asian/Western North Pacific sectors, respectively. Opposite situation is for weak years. For interannual variations of EOF2 mode, the seesaw patterns with enhanced BSISO activity over the southeastern EIO while weakened activity over the EWP mostly occur in the La Niña developing summers, but inverse patterns appear in the El Niño developing summers.
    Schlagwörter El Nino ; La Nina ; climate ; intraseasonal oscillation ; monsoon season ; standard deviation ; summer ; surface water temperature ; Indian Ocean
    Sprache Englisch
    Erscheinungsverlauf 2019-02
    Umfang p. 1651-1672.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-018-4216-1
    Datenquelle NAL Katalog (AGRICOLA)

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  5. Artikel: Coordinated influences of the tropical and extratropical intraseasonal oscillations on the 10–30-day variability of the summer rainfall over southeastern China

    Li, Jianying / Mao, Jiangyu

    Climate dynamics. 2019 July, v. 53, no. 1-2

    2019  

    Abstract: This study explores the spatial variations and physical mechanisms of 10–30-day rainfall anomalies over southeastern China based on daily station-observed rainfall data for the period 1979–2015. Empirical orthogonal function analysis shows that the ... ...

    Abstract This study explores the spatial variations and physical mechanisms of 10–30-day rainfall anomalies over southeastern China based on daily station-observed rainfall data for the period 1979–2015. Empirical orthogonal function analysis shows that the dominant spatial distribution of 10–30-day rainfall anomalies is a monopole pattern over the south of the middle and lower reaches of the Yangtze River Valley (SMLY). Lead-lag composites reveal that the evolution of such a monopole pattern depends on the coordinated influences of 10–30-day atmospheric intraseasonal oscillations (ISOs) from the tropics and mid-high latitudes. In the upper troposphere, the southeastward-propagating Rossby wave train from the mid-high latitudes, which presents as anomalous anticyclones and cyclones alternating over eastern Europe to southeastern coastal area of China, induces strong ascents (descents) over the SMLY via vorticity advection. Circulation anomalies associated with tropical ISO over East Asia/Western North Pacific trigger a vertical cell with strong updraft (downdraft) over the SMLY and downdraft (updraft) to the south, further enhancing the ascents (descents) over the SMLY, forming the wet (dry) phases of 10–30-day rainfall anomalies. Moreover, due to the meridional non-uniformity of ISO-related diabatic heating along the Indian Ocean longitudes, an anticyclone (cyclone) is generated over the central Indian–northern Bay of Bengal, which tends to anchor the anomalous ascents (descents) over the SMLY through its interaction with the intraseasonal Rossby wave from mid-high latitudes, thus favoring the persistence of wet (dry) phases of the 10–30-day SMLY rainfall anomalies.
    Schlagwörter advection ; coasts ; intraseasonal oscillation ; latitude ; meteorological data ; rain ; river valleys ; summer ; tropics ; troposphere ; Bay of Bengal ; China ; Eastern European region ; Indian Ocean ; Yangtze River
    Sprache Englisch
    Erscheinungsverlauf 2019-07
    Umfang p. 137-153.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-018-4574-8
    Datenquelle NAL Katalog (AGRICOLA)

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  6. Artikel: Intraseasonal responses of sea surface and deep oceanic temperature anomalies in the northern Indian Ocean–western Pacific to the 30–60-day boreal summer atmospheric intraseasonal oscillation

    Mao, Jiangyu / Wang, Ming

    Climate dynamics. 2019 Oct., v. 53, no. 7-8

    2019  

    Abstract: The 30–60-day boreal summer atmospheric intraseasonal oscillation (BSISO) is the predominant intraseasonal variability of the Asian summer monsoon, and has a strong dynamical and thermodynamical impact on the underlying oceans in the northern Indian ... ...

    Abstract The 30–60-day boreal summer atmospheric intraseasonal oscillation (BSISO) is the predominant intraseasonal variability of the Asian summer monsoon, and has a strong dynamical and thermodynamical impact on the underlying oceans in the northern Indian Ocean–western Pacific. This study uses composite analysis of satellite-observed sea surface temperature (SST) data, as well as atmospheric and oceanic reanalysis datasets for the period 1998–2013, to identify the intraseasonal behavior of SST and deep ocean temperatures during the life cycle of the BSISO. With the BSISO as an organized entity evolving both eastward and northward from the equatorial Indian Ocean, the BSISO-induced SST anomalies propagate coherently into several basins, including the Arabian Sea, Bay of Bengal, South China Sea, and western Pacific, characterized by the alternate occurrence of basin-wide positive and negative SST anomalies, which primarily respond to the active and suppressed convection phases of the BSISO due to anomalous southwesterlies and northeasterlies together with the resultant surface heating anomalies. Significant BSISO-induced oceanic temperature anomalies occur in the equatorial Indian Ocean and western Pacific, with the largest-amplitude anomalous signals arising around the thermocline and extending downward into the deep ocean to below 1000 m or more, which are associated with the equatorial eastward-propagating oceanic Kelvin waves forced by anomalous surface wind stress. However, the local and remote effects of such equatorial oceanic Kelvin waves on the SST and deep oceanic temperature anomalies, especially north of the equator, differ from different basins through the consequential coastal Kelvin waves and reflected Rossby waves.
    Schlagwörter basins ; climate ; convection ; data collection ; intraseasonal oscillation ; monsoon season ; oceans ; seasonal variation ; summer ; surface water temperature ; wind stress ; Arabian Sea ; Bay of Bengal ; Indian Ocean ; South China Sea
    Sprache Englisch
    Erscheinungsverlauf 2019-10
    Umfang p. 4539-4552.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-019-04806-0
    Datenquelle NAL Katalog (AGRICOLA)

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  7. Artikel: Potential vorticity perspective of the genesis of a Tibetan Plateau vortex in June 2016

    Wu, Guoxiong / Tang, Yiqiong / He, Bian / Liu, Yimin / Mao, Jiangyu / Ma, Tingting / Ma, Ting

    Climate dynamics. 2022 June, v. 58, no. 11-12

    2022  

    Abstract: At midnight on 27–28 June 2016, a Tibetan Plateau (TP) Vortex (TPV) generated over the western TP that subsequently caused a downstream record-breaking rainstorm and extremely severe natural disaster. Based on reanalysis data and satellite imagery, this ... ...

    Abstract At midnight on 27–28 June 2016, a Tibetan Plateau (TP) Vortex (TPV) generated over the western TP that subsequently caused a downstream record-breaking rainstorm and extremely severe natural disaster. Based on reanalysis data and satellite imagery, this study investigates the formation of this TPV from a potential vorticity (PV) perspective. Results show that, in late June 2016, a remarkable circulation anomaly occurred over the TP and its peripheral area, with easterly flow in the middle and lower troposphere developing in the subtropical zone, replacing the normal westerly flow there. Its forefront merged with the southwesterly flow from the west and penetrated and converged over the western TP where the surface was warmer than normal, forming a low-level jet and downward slantwise isentropic surfaces in-situ. When the air parcel slid down the slantwise isentropic surface, its vertical relative vorticity developed owing to slantwise vorticity development associated with PV restructuring. At the same time, the penetrating southwesterly flow brought abundant water vapor to the western TP and induced increasing sub-cloud entropy and air ascent there. Low-layer cloud formed and the cloud liquid water content increased. The strong latent heat that was released in association with the formation of cloud produced strong diabatic heating near 400 hPa at night and strong PV generation below. The normal diurnal variation was interrupted and the vortex was generated near the surface. These results demonstrate that, against a favorable circulation background, both adiabatic and diabatic PV processes are crucial for TPV genesis.
    Schlagwörter air ; diurnal variation ; dynamics ; entropy ; heat ; latent heat ; liquids ; remote sensing ; subtropics ; troposphere ; water content ; water vapor ; China
    Sprache Englisch
    Erscheinungsverlauf 2022-06
    Umfang p. 3351-3367.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-021-06102-2
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  8. Artikel: A case study of the impact of boreal summer intraseasonal oscillations on Yangtze rainfall

    Li, Jianying / Mao, Jiangyu / Wu, Guoxiong

    Climate dynamics. 2015 May, v. 44, no. 9-10

    2015  

    Abstract: The impact on Yangtze rainfall of the boreal summer intraseasonal oscillations (BSISOs) over the entire Asian summer monsoon region during summer 1996 was investigated using the APHRODITE gridded rainfall and the NCEP–DOE reanalysis II products. Wavelet ... ...

    Abstract The impact on Yangtze rainfall of the boreal summer intraseasonal oscillations (BSISOs) over the entire Asian summer monsoon region during summer 1996 was investigated using the APHRODITE gridded rainfall and the NCEP–DOE reanalysis II products. Wavelet analyses suggest that the ISOs of Yangtze rainfall were regulated mainly by both 30–60- and 10–25-day oscillations, respectively linked to BSISO1 and BSISO2 activity. Phase locking of the wet phases of these two ISOs resulted in a prolonged wet episode from late June to mid-July. The circulation evolution of the BSISO1 mode showed that active convection accompanied by strong convergence of anomalous zonal winds first developed over the equatorial Indian Ocean, with suppressed convection over the South China Sea (SCS)–Philippine Sea and with active convection over the Yangtze Basin. The triple convection anomaly that aligned meridionally in the East Asian sector arose from a local meridional–vertical cell associated with a Rossby wave-like coupled circulation–convection system. The opposite flow patterns occurred during the dry phase of Yangtze rainfall. The composite BSISO2 cases demonstrated a weak convective anomaly initially appeared around the Maritime Continent, with a huge anomalous anticyclone accompanied by suppressed convection over the SCS–Philippine Sea. The low-level convergence of the anomalous southwesterlies on the northwestern side of the anticyclone and the consequent ascent led to positive rainfall anomalies over the Yangtze Basin. When the entire SCS was dominated by an anomalous cyclone resulting from interaction with upstream systems, convection over the Yangtze Basin was suppressed.
    Schlagwörter case studies ; climate ; intraseasonal oscillation ; monsoon season ; rain ; summer ; wavelet ; wind ; Indian Ocean ; South China Sea
    Sprache Englisch
    Erscheinungsverlauf 2015-05
    Umfang p. 2683-2702.
    Erscheinungsort Springer-Verlag
    Dokumenttyp Artikel
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-014-2425-9
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  9. Artikel: Different multi-fractal behaviors of diurnal temperature range over the north and the south of China

    Yuan, Naiming / Fu, Zuntao / Mao, Jiangyu

    Theoretical and applied climatology. 2013 May, v. 112, no. 3-4

    2013  

    Abstract: Multi-fractal behaviors of diurnal temperature range (DTR for short) from 100 stations over China during 1956–2010 are analyzed by means of multi-fractal detrended fluctuation analysis. By making a Monte-Carlo simulation, we obtain two criterions which ... ...

    Abstract Multi-fractal behaviors of diurnal temperature range (DTR for short) from 100 stations over China during 1956–2010 are analyzed by means of multi-fractal detrended fluctuation analysis. By making a Monte-Carlo simulation, we obtain two criterions which can be used to decide whether a DTR series is significantly multi-fractal or not. With these criterions, different multi-fractal behaviors are found over the north and the south of China, and Yangtze River is roughly the dividing line. Over the north region, nearly all the considered DTR series do not show multi-fractal behaviors, while the results are completely the opposite over the south. The findings are confirmed by the scaling behaviors of the corresponding DTR magnitude series and indicate that more scale-dependent structure differences may be hidden in DTR series over the north and the south of China. Therefore, an extensive analysis of the multi-fractal behaviors are essential for a better understanding of the complex structures of the climate changes.
    Schlagwörter climate change ; temperature ; China ; Yangtze River
    Sprache Englisch
    Erscheinungsverlauf 2013-05
    Umfang p. 673-682.
    Erscheinungsort Springer-Verlag
    Dokumenttyp Artikel
    ZDB-ID 1463177-5
    ISSN 1434-4483 ; 0177-798X
    ISSN (online) 1434-4483
    ISSN 0177-798X
    DOI 10.1007/s00704-012-0762-3
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  10. Artikel: Effect of extreme value loss on long-term correlated time series

    Yuan, Naiming / Fu, Zuntao / Li, Huiqun / Mao, Jiangyu

    Theor Appl Climatol. 2012 July, v. 109, no. 1-2

    2012  

    Abstract: Effects of extreme value loss on long-term correlated time series are analyzed by means of detrended fluctuation analysis (DFA) and power spectral density analysis. Weaker memory can be detected after removing of extreme values for the artificial long- ... ...

    Abstract Effects of extreme value loss on long-term correlated time series are analyzed by means of detrended fluctuation analysis (DFA) and power spectral density analysis. Weaker memory can be detected after removing of extreme values for the artificial long-term correlated data, indicating the emergence of extreme events may be closely related to long-term memory. For observational temperature records, similar results are obtained, but not in all stations. For example, in some stations, only extending of scaling range to smaller time scales occurs, which may be due to the asymmetric distribution of values in the record. By comparing our findings with previous works, clustered positions of the extreme events are recognized as an important property in long-term correlated records. Through a simple numerical test, close relations between extreme events and long-term memory are discovered, which is helpful for our understanding of the effects of extreme value loss on long-term correlated records.
    Schlagwörter memory ; spectral analysis ; temperature ; time series analysis
    Sprache Englisch
    Erscheinungsverlauf 2012-07
    Umfang p. 133-140.
    Erscheinungsort Springer-Verlag
    Dokumenttyp Artikel
    ZDB-ID 1463177-5
    ISSN 1434-4483 ; 0177-798X
    ISSN (online) 1434-4483
    ISSN 0177-798X
    DOI 10.1007/s00704-011-0566-x
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