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  1. AU="Rimbu, Norel"
  2. AU="Crann, Sara"
  3. AU="Ottino-González, Jonatan"
  4. AU="Klok, Peter F"
  5. AU="Bárbara Ayala-Orozco"
  6. AU=Goudsmit Jaap AU=Goudsmit Jaap
  7. AU="Qian, Junbin"
  8. AU="Paola Pulido-Santacruz"

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  1. Article: Possible North Atlantic origin for changes in ENSO properties during the 1970s

    Dima, Mihai / Lohmann, Gerrit / Rimbu, Norel

    Climate dynamics. 2015 Feb., v. 44, no. 3-4

    2015  

    Abstract: The most intense El Niño episodes in more than a century occurred after the 1970s climate shift. Previous studies show that the characteristics of the El Niño-Southern Oscillation (ENSO) phenomenon changed synchronously with the shift, but the associated ...

    Abstract The most intense El Niño episodes in more than a century occurred after the 1970s climate shift. Previous studies show that the characteristics of the El Niño-Southern Oscillation (ENSO) phenomenon changed synchronously with the shift, but the associated causes are not fully understood. An analysis of the observed tropical Pacific sea surface temperature (SST) anomalies shows that their increase in the eastern part of the basin after the 1970s is not related to the canonical ENSO pattern, but to the tropical Pacific meridional mode (TPMM). We present observational evidence which supports the hypothesis that the change in the TPMM was triggered by the great salinity anomaly (GSA), which manifested in the North Atlantic during the late 1960s. The GSA induced a weak Labrador convection and a SST dipole south of Greenland. The associated atmospheric structure includes a North Pacific Oscillation sea level pressure dipole in the Pacific sector. This excites the TPMM which contributes to the intense El Niño events and to the enhanced ENSO’s asymmetry, observed after the shift. Our results imply that, if the GSA has not an anthropic origin, as was suggested, then the tropical Pacific climate shift has a natural origin. This is supported by the end of the North Atlantic regime in the 1990s and by the rebound of the tropical Pacific after 1998.
    Keywords El Nino ; climate ; salinity ; sea level ; surface water temperature ; Greenland
    Language English
    Dates of publication 2015-02
    Size p. 925-935.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-014-2173-x
    Database NAL-Catalogue (AGRICOLA)

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  2. Book ; Online: Atmospheric circulation patterns associated with the variability of River Ammer floods

    Rimbu, Norel / Czymzik, Markus / Ionita, Monica / Lohmann, Gerrit / Brauer, Achim

    eISSN: 1814-9332

    evidence from observed and proxy data

    2018  

    Abstract: The relationship between the frequency of River Ammer floods (southern Germany) and atmospheric circulation variability is investigated based on observational Ammer River discharge data back to 1926 and a flood layer time series from varved sediments of ... ...

    Abstract The relationship between the frequency of River Ammer floods (southern Germany) and atmospheric circulation variability is investigated based on observational Ammer River discharge data back to 1926 and a flood layer time series from varved sediments of the downstream Lake Ammer for the pre-instrumental period back to 1766. A composite analysis reveals that, at synoptic timescales, observed River Ammer floods are associated with enhanced moisture transport from the Atlantic Ocean and the Mediterranean towards the Ammer region, a pronounced trough over western Europe as well as enhanced potential vorticity at upper levels. We argue that this synoptic-scale configuration can trigger heavy precipitation and floods in the Ammer region. Interannual to multidecadal increases in flood frequency, as detected in the instrumental discharge record, are associated with a wave train pattern extending from the North Atlantic to western Asia, with a prominent negative center over western Europe. A similar atmospheric circulation pattern is associated with increases in flood layer frequency in the Lake Ammer sediment record during the pre-instrumental period. We argue that the complete flood layer time series from Lake Ammer sediments covering the last 5500 years contains information about atmospheric circulation variability on interannual to millennial timescales.
    Subject code 550 ; 551
    Language English
    Publishing date 2018-09-27
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: Multidecadal variability of summer temperature over Romania and its relation with Atlantic Multidecadal Oscillation

    Ionita, Monica / Rimbu, Norel / Chelcea, Silvia / Patrut, Simona

    Theoretical and applied climatology. 2013 July, v. 113, no. 1-2

    2013  

    Abstract: We investigate the multidecadal variability of summer temperature over Romania as measured at 14 meteorological stations with long-term observational records. The dominant pattern of summer temperature variability has a monopolar structure and shows ... ...

    Abstract We investigate the multidecadal variability of summer temperature over Romania as measured at 14 meteorological stations with long-term observational records. The dominant pattern of summer temperature variability has a monopolar structure and shows pronounced multidecadal variations. A correlation analysis reveals that these multidecadal variations are related with multidecadal variations in the frequency of four daily atmospheric circulation patterns from the North Atlantic region. It is found that on multidecadal time scales, negative summer mean temperature (TT) anomalies are associated with positive sea level pressure (SLP) anomalies centered over the northern part of the Atlantic Ocean and Scandinavia and negative SLP anomalies centered over the northern part of Africa. It is speculated that a possible cause of multidecadal fluctuations in the frequency of these four patterns are the sea surface temperature (SST) anomalies associated to the Atlantic Multidecadal Oscillation (AMO). These results have implications for predicting the evolution of summer temperature over Romania on multidecadal time scales.
    Keywords atmospheric circulation ; sea level ; summer ; surface temperature ; Atlantic Ocean ; Romania
    Language English
    Dates of publication 2013-07
    Size p. 305-315.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 1463177-5
    ISSN 1434-4483 ; 0177-798X
    ISSN (online) 1434-4483
    ISSN 0177-798X
    DOI 10.1007/s00704-012-0786-8
    Database NAL-Catalogue (AGRICOLA)

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  4. Book ; Online: Large-scale climate signals of a European oxygen isotope network from tree rings

    Balting, Daniel F. / Ionita, Monica / Wegmann, Martin / Helle, Gerhard / Schleser, Gerhard H. / Rimbu, Norel / Freund, Mandy B. / Heinrich, Ingo / Caldarescu, Diana / Lohmann, Gerrit

    eISSN: 1814-9332

    2021  

    Abstract: We investigate the climate signature of δ 18 O tree-ring records from sites distributed all over Europe covering the last 400 years. An empirical orthogonal function (EOF) analysis reveals two distinct modes of variability on the basis of the existing δ ... ...

    Abstract We investigate the climate signature of δ 18 O tree-ring records from sites distributed all over Europe covering the last 400 years. An empirical orthogonal function (EOF) analysis reveals two distinct modes of variability on the basis of the existing δ 18 O tree-ring records. The first mode is associated with anomaly patterns projecting onto the El Niño–Southern Oscillation (ENSO) and reflects a multi-seasonal climatic signal. The ENSO link is pronounced for the last 130 years, but it is found to be weak over the period from 1600 to 1850, suggesting that the relationship between ENSO and the European climate may not be stable over time. The second mode of δ 18 O variability, which captures a north–south dipole in the European δ 18 O tree-ring records, is related to a regional summer atmospheric circulation pattern, revealing a pronounced centre over the North Sea. Locally, the δ 18 O anomalies associated with this mode show the same (opposite) sign with temperature (precipitation). Based on the oxygen isotopic signature derived from tree rings, we argue that the prevailing large-scale atmospheric circulation patterns and the related teleconnections can be analysed beyond instrumental records.
    Subject code 333
    Language English
    Publishing date 2021-05-07
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Book ; Online: Large scale climate signals of a European oxygen isotope network from tree-rings – predominantly caused by ENSO teleconnections?

    Balting, Daniel F. / Ionita, Monica / Wegmann, Martin / Helle, Gerhard / Schleser, Gerhard H. / Rimbu, Norel / Freund, Mandy B. / Heinrich, Ingo / Caldarescu, Diana / Lohmann, Gerrit

    eISSN: 1814-9332

    2020  

    Abstract: We investigate the annual variability of δ 18 O tree ring records from sites distributed all over Europe covering the last 400 years. An Empirical Orthogonal Function (EOF) analysis reveals two distinct modes of variability on the basis of the existing δ ...

    Abstract We investigate the annual variability of δ 18 O tree ring records from sites distributed all over Europe covering the last 400 years. An Empirical Orthogonal Function (EOF) analysis reveals two distinct modes of variability on the basis of the existing δ 18 O tree ring records. The first mode of δ 18 O variability is associated with anomaly patterns of the El Niño-Southern Oscillation (ENSO) and reflects a multi-seasonal climatic signal. The ENSO signal is visible for the last 130 years, but is found weak during the period 1600 to 1850 suggesting that the relationship between ENSO and the European climate may not stable over time. The second mode of δ 18 O variability, which captures an out-of-phase variability between northwestern and southeastern European δ 18 O tree ring records, is related to a regional summer atmospheric circulation pattern revealing a pronounced centre over the North Sea. Locally, the δ 18 O anomalies associated with this mode show the same (opposite) sign with temperature (precipitation). We infer that the investigation of large-scale atmospheric circulation patterns and related teleconnections far beyond instrumental records can be done with oxygen isotopic signature derived from tree rings. However, the European δ 18 O cel tree network needs to be consolidated and updated, as well as additional research on the stationarity of reconstructed climate signals and the stationarity of teleconnections is advisable.
    Subject code 333
    Language English
    Publishing date 2020-03-30
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Winter and summer climate patterns in the European-Middle East during recent centuries as documented in a northern Red Sea coral record

    Rimbu, Norel / Felis, Thomas / Lohmann, Gerrit / Päatzold, Jürgen

    Holocene. 2006 Apr., v. 16, no. 3

    2006  

    Abstract: The Ras Umm Sidd coral 6180 record from the northern Red Sea is the northernmost centuries long coral time series that is currently available in seasonal resolution (AD 1750-1995). Here we investigate climate patterns associated with the coral 6180 time ... ...

    Abstract The Ras Umm Sidd coral 6180 record from the northern Red Sea is the northernmost centuries long coral time series that is currently available in seasonal resolution (AD 1750-1995). Here we investigate climate patterns associated with the coral 6180 time series separately for boreal winter and summer, using instrumental and reconstructed climate fields for the European-Middle East region. The winter coral 6180 record is associated with dominant modes of sea-level pressure, temperature and precipitation variability in the European-Middle East region, which reflect the Arctic Oscillation/North Atlantic Oscillation (AO/ NAO) phenomenon. The summer coral 6180 record is associated with an atmospheric pattern having its main centre of action over southwestern Scandinavia/northern Great Britain. The connection between these large-scale atmospheric circulation patterns and the coral time series was stable during the past 250 years. During winter, eastern Mediterranean/Middle East climate, as reflected in the coral 6180 record, is strongly controlled by the AO/NAO. In contrast, large-scale atmospheric circulation processes over the European-Middle East region are relatively less important for northern Red Sea climate during summer. The results suggest a high potential for seasonally resolved proxy records derived from fossil corals of the northern Red Sea to provide information on winter and summer climate patterns of the Middle East European region for time intervals of the Holocene epoch or the last interglacial period.
    Keywords atmospheric circulation ; climate ; corals ; fossils ; Holocene epoch ; North Atlantic Oscillation ; sea level ; summer ; temperature ; time series analysis ; winter ; Arctic region ; Great Britain ; Middle East ; Red Sea ; Scandinavia
    Language English
    Dates of publication 2006-04
    Size p. 321-330.
    Publishing place Sage Publications
    Document type Article
    ZDB-ID 2027956-5
    ISSN 1477-0911 ; 0959-6836
    ISSN (online) 1477-0911
    ISSN 0959-6836
    DOI 10.1191/0959683606hl930rp
    Database NAL-Catalogue (AGRICOLA)

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  7. Book ; Online: Ogasawara winter Sr/Ca and U/Ca data of coral core OGA-02-1 and PDO reconstruction (coral-geoduck index), supplementary data to: Felis, Thomas; Suzuki, Atsushi; Kuhnert, Henning; Rimbu, Norel; Kawahata, Hodaka (2010): Pacific Decadal Oscillation documented in a coral record of North Pacific winter temperature since 1873. Geophysical Research Letters, 37, L14605

    Felis, Thomas / Kawahata, Hodaka / Kuhnert, Henning / Rimbu, Norel / Suzuki, Atsushi

    2010  

    Abstract: The Pacific Decadal Oscillation (PDO), the leading mode of sea surface temperature (SST) anomalies in the extratropical North Pacific Ocean, has widespread impacts on precipitation in the Americas and marine fisheries in the North Pacific. However, ... ...

    Abstract The Pacific Decadal Oscillation (PDO), the leading mode of sea surface temperature (SST) anomalies in the extratropical North Pacific Ocean, has widespread impacts on precipitation in the Americas and marine fisheries in the North Pacific. However, marine proxy records with a temporal resolution that resolves interannual to interdecadal SST variability in the extratropical North Pacific are extremely rare. Here we demonstrate that the winter Sr/Ca and U/Ca records of an annually-banded reef coral from the Ogasawara Islands in the western subtropical North Pacific are significantly correlated with the instrumental winter PDO index over the last century. The reconstruction of the PDO is further improved by combining the coral data with an existing eastern mid-latitude North Pacific growth ring record of geoduck clams. The spatial correlations of this combined index with global climate fields suggest that SST proxy records from these locations provide potential for PDO reconstructions further back in time.
    Language English
    Dates of publication 2010-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1029/2010GL043572
    DOI 10.1594/PANGAEA.744046
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  8. Article: Distinct modes of bidecadal and multidecadal variability in a climate reconstruction of the last centuries from a South Pacific coral

    Dima, Mihai / Felis, Thomas / Lohmann, Gerrit / Rimbu, Norel

    Climate dynamics. 2005 Aug., v. 25, no. 2-3

    2005  

    Abstract: The Rarotonga coral Sr/Ca time series (Linsley et al. in Science 290:1145-1148, 2000) provides a near-monthly resolved proxy record of South Pacific climate variability over the last ~300 years. Here we show that two distinct interdecadal, quasi-periodic ...

    Abstract The Rarotonga coral Sr/Ca time series (Linsley et al. in Science 290:1145-1148, 2000) provides a near-monthly resolved proxy record of South Pacific climate variability over the last ~300 years. Here we show that two distinct interdecadal, quasi-periodic time components with periods of ~80 and ~25 years can be identified in this time series by Singular Spectrum Analysis. Their associated spatial patterns in the global sea surface temperature (SST) field show notable differences. Whereas the multidecadal component is associated with a global SST pattern that was recently associated with solar forcing on multidecadal timescales, the bidecadal component is associated with a well known pattern of Pacific decadal to interdecadal SST variability.
    Keywords calcium ; climate ; corals ; strontium ; surface temperature ; time series analysis
    Language English
    Size p. 329-336.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 1471747-5
    ISSN 1432-0894 ; 0930-7575
    ISSN (online) 1432-0894
    ISSN 0930-7575
    DOI 10.1007/s00382-005-0043-2
    Database NAL-Catalogue (AGRICOLA)

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  9. Book ; Online: Sea-surface temperature reconstruction of sediments from the North Pacific and North Atlantic, supplementary data to: Kim, Jung-Hyun; Rimbu, Norel; Lorenz, Stefan J; Lohmann, Gerrit; Schneider, Ralph R; Nam, Seung-Il; Schouten, Stefan; Sirocko, Frank; R?hlemann, Carsten (2004): North Pacific and North Atlantic sea-surface temperature variability during the Holocene. Quaternary Science Reviews, 23(20-22), 2141-2154

    Kim, Jung-Hyun / Lohmann, Gerrit / Lorenz, Stefan J / Nam, Seung-Il / R?hlemann, Carsten / Rimbu, Norel / Schneider, Ralph R / Schouten, Stefan

    2004  

    Abstract: Holocene climate variability is investigated in the North Pacific and North Atlantic realms, using alkenone-derived sea-surface temperature (SST) records as well as a millennial scale simulation with a coupled atmosphere-ocean general circulation model ( ... ...

    Abstract Holocene climate variability is investigated in the North Pacific and North Atlantic realms, using alkenone-derived sea-surface temperature (SST) records as well as a millennial scale simulation with a coupled atmosphere-ocean general circulation model (AOGCM). The alkenone SST data indicate a temperature increase over almost the entire North Pacific from 7?cal?kyr BP to the present. A dipole pattern with a continuous cooling in the northeastern Atlantic and a warming in the eastern Mediterranean Sea and the northern Red Sea is detected in the North Atlantic realm. Similarly, SST variations are opposite in sign between the northeastern Pacific and the northeastern Atlantic. A 2300 year long AOGCM climate simulation reveals a similar SST seesaw between the northeastern Pacific and the northeastern Atlantic on centennial time scales. Our analysis of the alkenone SST data and the model results suggests fundamental inter-oceanic teleconnections during the Holocene.
    Language English
    Dates of publication 2004-9999
    Size Online-Ressource
    Publisher PANGAEA - Data Publisher for Earth & Environmental Science
    Publishing place Bremen/Bremerhaven
    Document type Book ; Online
    Note This dataset is supplement to doi:10.1016/j.quascirev.2004.08.010
    DOI 10.1594/PANGAEA.738435
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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