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  1. Book ; Online: An Atlas of the Global Water Cycle

    Lim, Wee Ho / Roderick, Michael L

    Based on the IPCC AR4 Climate Models

    2009  

    Keywords Hydrology & the hydrosphere ; Aquatic Sciences
    Language English
    Size 1 Online-Ressource
    Publisher ANU Press
    Document type Book ; Online
    Note English
    HBZ-ID HT030610422
    ISBN 9781921536885 ; 1921536888
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Book ; Online: An Atlas on Global Water Cycle

    Lim, Wee Ho / Roderick, Michael L.

    2009  

    Abstract: What do climate models predict for the rainfall where you live? What about evaporation or runoff? Should your local community consider constructing new dams or do the existing water storages appear adequate? What about the availability of water for ... ...

    Abstract What do climate models predict for the rainfall where you live? What about evaporation or runoff? Should your local community consider constructing new dams or do the existing water storages appear adequate? What about the availability of water for irrigation farming? Do the predictions differ between different climate models or do all the models basically predict the same changes in water availability where you live? These are all simple questions but it is surprisingly hard for an individual, whether they be a farmer, water resources engineer, teacher or interested citizen, to answer them. As researchers active in the field we could not answer the questions either. In fact, we had never seen a compilation of the rainfall, evaporation and runoff predictions made by all the different climate models.The Atlas contains maps and tables that document model predictions contributed by international climate modelling groups to the 2007 4th Assessment Report of the Intergovernmental Panel on Climate Change. The predictions are made available here via the wonders of the internet and ongoing cooperation by the international climate modelling community who routinely archive their results.The maps and tables in the Atlas document rainfall, evaporation and runoff estimates for the 20th century along with predictions of the same quantities at the end of the 21st century. Whatever your interest, we hope you find the Atlas as helpful as we do
    Keywords Environmental sciences
    Size 1 electronic resource (293 p.)
    Publisher ANU Press
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT020087542
    ISBN 9781921536892 ; 1921536896
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  3. Article ; Online: Linking wood density with tree growth and environment: a theoretical analysis based on the motion of water.

    Roderick, Michael L / Berry, Sandra L

    The New phytologist

    2020  Volume 149, Issue 3, Page(s) 473–485

    Abstract: An hydraulic model of a tree stem is presented to help understand how the carbon storage in ecosystems varies with changing environmental conditions. • The model is based on the assumption that a tree stem is a collection of parallel pipes and was used ...

    Abstract • An hydraulic model of a tree stem is presented to help understand how the carbon storage in ecosystems varies with changing environmental conditions. • The model is based on the assumption that a tree stem is a collection of parallel pipes and was used to (qualitatively) predict how the mass concentration of dry matter ([D]) would vary with water temperature (via changes in viscosity), nitrogen supply and atmospheric CO
    Language English
    Publishing date 2020-10-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1046/j.1469-8137.2001.00054.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 868: Show issues

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  4. Article ; Online: Reply to Comment on “Potential Evaporation and the Complementary Relationship” by Jozsef Szilagyi

    Tu, Zhuoyi / Yang, Yuting / Roderick, Michael L. / McVicar, Tim R.

    Water Resources Research. 2023 July, v. 59, no. 7 p.e2023WR035150-

    2023  

    Abstract: We appreciate Dr Szilagyi's interest in our article on potential evaporation and the complementary relationship (CR). For his first concern on the assumption of constant net radiation versus constant net solar radiation in the estimation of potential ... ...

    Abstract We appreciate Dr Szilagyi's interest in our article on potential evaporation and the complementary relationship (CR). For his first concern on the assumption of constant net radiation versus constant net solar radiation in the estimation of potential evaporation, here we show that the constant net solar radiation condition is more universally applicable both in observations and from a theoretical perspective. For his second concern on the CR model calibration, we clarify herein that no calibrations were used in our applications of the various CR models. Instead, the parameter values were all directly taken from previous studies to ensure a fair and practically meaningful inter‐model comparison.
    Keywords evaporation ; net radiation ; research ; solar radiation ; water
    Language English
    Dates of publication 2023-07
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note LETTER
    ZDB-ID 5564-5
    ISSN 1944-7973 ; 0043-1397
    ISSN (online) 1944-7973
    ISSN 0043-1397
    DOI 10.1029/2023WR035150
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 4285: Show issues

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  5. Article ; Online: Potential Evaporation and the Complementary Relationship

    Tu, Zhuoyi / Yang, Yuting / Roderick, Michael L. / McVicar, Tim R.

    Water Resources Research. 2023 Mar., v. 59, no. 3 p.e2022WR033763-

    2023  

    Abstract: The complementary relationship (CR) provides a framework for estimating land surface evaporation with basic meteorological observations by acknowledging the relationship between actual evaporation, apparent potential evaporation and potential evaporation ...

    Abstract The complementary relationship (CR) provides a framework for estimating land surface evaporation with basic meteorological observations by acknowledging the relationship between actual evaporation, apparent potential evaporation and potential evaporation (Eₚₒ). As a key variable in the CR, Eₚₒ estimates by conventional models have a long‐standing problem in practical applications. That is, the meteorological forcings (i.e., radiation and temperature) employed in conventional Eₚₒ models are observed under actual conditions that are generally not saturated. Hence, conventional Eₚₒ models do not conform to the original definition of Eₚₒ (i.e., the evaporation that would occur with an unlimited water supply). Here, we estimate Eₚₒ using the maximum evaporation approach (Eₚₒ_ₘₐₓ) that does follow the original Eₚₒ definition. We find that adopting Eₚₒ_ₘₐₓ considerably reduces the asymmetry of the CR compared to when the conventional Priestley‐Taylor Eₚₒ is used. We then employ Eₚₒ_ₘₐₓ and develop a new physically based, calibration‐free CR model, which shows an overall good performance in estimating actual evaporation in 705 catchments at the mean annual scale and 64 flux sites at monthly and mean annual scales (R² ranges from 0.73 to 0.75 and root‐mean‐squared error ranges from 9.8 to 18.8 W m⁻²).Both the 705 catchments and 64 flux sites cover a wide range of climates. More importantly, the use of Eₚₒ_ₘₐₓ leads to a new physical interpretation of the CR.
    Keywords asymmetry ; evaporation ; models ; research ; temperature ; water ; water supply
    Language English
    Dates of publication 2023-03
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 5564-5
    ISSN 1944-7973 ; 0043-1397
    ISSN (online) 1944-7973
    ISSN 0043-1397
    DOI 10.1029/2022WR033763
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 4285: Show issues

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  6. Article: Using the Complementary Relationship Between Actual and Potential Evaporation to Diagnose the Onset of Heatwaves

    Aminzadeh, Milad / Roderick, Michael L. / Or, Dani

    Water resources research. 2021 Nov., v. 57, no. 11

    2021  

    Abstract: Prolonged periods of extremely high temperatures with lack of precipitation mark heatwaves that pose health risks and damage ecosystems via rapid soil water depletion and reduced evaporative cooling. Identifying the conditions for the onset of heatwaves ... ...

    Abstract Prolonged periods of extremely high temperatures with lack of precipitation mark heatwaves that pose health risks and damage ecosystems via rapid soil water depletion and reduced evaporative cooling. Identifying the conditions for the onset of heatwaves and their effects on land‐atmosphere energy and mass fluxes remains a challenge. We propose using the generalized complementary relationship (CR) to estimate actual evaporation from heterogeneous landscapes overlain by different vegetation types (i.e., grasslands and forests) and quantify responses to radiation and air temperature anomalies. A strong correlation between air temperature and sensible heat flux anomalies deduced from FLUXNET data suggests that abrupt exceedances of sensible heat flux above climatological means are indicators for the onset of heatwaves. We capitalize on the coupling between latent and sensible heat fluxes and their links to soil moisture availability within the CR framework to predict anomalous increases in regional sensible heat flux associated with soil water depletion (low precipitation) and extreme evaporative demand (hot air and high radiation). The systematic and energy‐constrained framework based on the CR concept provides insights into the triggering and feedbacks associated with heatwaves and hydro‐climatic extremes such as regional droughts.
    Keywords air ; air temperature ; cooling ; energy ; evaporation ; evaporative demand ; research ; sensible heat flux ; soil water
    Language English
    Dates of publication 2021-11
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 5564-5
    ISSN 1944-7973 ; 0043-1397
    ISSN (online) 1944-7973
    ISSN 0043-1397
    DOI 10.1029/2020WR029156
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 4285: Show issues

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  7. Article: The terrestrial water cycle in a warming world

    McColl, Kaighin A. / Roderick, Michael L. / Berg, Alexis / Scheff, Jacob

    Nature climate change

    2022  Volume 12, Issue 7, Page(s) 604

    Language English
    Document type Article
    ZDB-ID 2614383-5
    ISSN 1758-678x
    Database Current Contents Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

    Z 7874: Show issues

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  8. Article ; Online: Hypothesis. Air embolisms exsolving in the transpiration water - the effect of constrictions in the xylem pipes.

    Canny, Martin J / Sparks, Jed P / Huang, Cheng X / Roderick, Michael L

    Functional plant biology : FPB

    2020  Volume 34, Issue 2, Page(s) 95–111

    Abstract: When water flows through a constriction, air can come out of solution (i.e. it can exsolve). This phenomenon is manifested in the transpiration stream of plants. Observations of gas in functioning xylem prompted a hypothesis predicting the daily balance ... ...

    Abstract When water flows through a constriction, air can come out of solution (i.e. it can exsolve). This phenomenon is manifested in the transpiration stream of plants. Observations of gas in functioning xylem prompted a hypothesis predicting the daily balance between air and water in wood: a sudden fall in water content at sunrise, followed by an increase in water content during the day. An extended record by time domain reflectometry of volumetric water content (VWC) every 2 h throughout a summer shows the detailed pattern of change of VWC during 25 individual days, giving good agreement with the hypothesis. This hypothesis has wide-ranging consequences for experiments using cut plant parts. Perfusing aqueous solutions through excised xylem also can exsolve air from the water, causing declines in flow. The location of such air was investigated in cryo-fixed perfused vine stems by cryo-scanning electron microscopy. Bubbles formed at residual walls of perforation plates in small vessels, and filled many large vessels. The input surface is revealed as a major source of exsolved air. Precautions to reduce this effect are outlined and discussed.
    Language English
    Publishing date 2020-07-21
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2071582-1
    ISSN 1445-4416 ; 1445-4408
    ISSN (online) 1445-4416
    ISSN 1445-4408
    DOI 10.1071/FP06210
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4753: Show issues

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  9. Article ; Online: Rainfall statistics, stationarity, and climate change.

    Sun, Fubao / Roderick, Michael L / Farquhar, Graham D

    Proceedings of the National Academy of Sciences of the United States of America

    2018  Volume 115, Issue 10, Page(s) 2305–2310

    Abstract: There is a growing research interest in the detection of changes in hydrologic and climatic time series. Stationarity can be assessed using the autocorrelation function, but this is not yet common practice in hydrology and climate. Here, we use a global ... ...

    Abstract There is a growing research interest in the detection of changes in hydrologic and climatic time series. Stationarity can be assessed using the autocorrelation function, but this is not yet common practice in hydrology and climate. Here, we use a global land-based gridded annual precipitation (hereafter
    Language English
    Publishing date 2018--06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1705349115
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (1.OG)
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  10. Article: Annual precipitation explains variability in dryland vegetation greenness globally but not locally

    Ukkola, Anna M. / De Kauwe, Martin G. / Roderick, Michael L. / Burrell, Arden / Lehmann, Peter / Pitman, Andy J.

    Global change biology. 2021 Sept., v. 27, no. 18

    2021  

    Abstract: Dryland vegetation productivity is strongly modulated by water availability. As precipitation patterns and variability are altered by climate change, there is a pressing need to better understand vegetation responses to precipitation variability in these ...

    Abstract Dryland vegetation productivity is strongly modulated by water availability. As precipitation patterns and variability are altered by climate change, there is a pressing need to better understand vegetation responses to precipitation variability in these ecologically fragile regions. Here we present a global analysis of dryland sensitivity to annual precipitation variations using long‐term records of normalized difference vegetation index (NDVI). We show that while precipitation explains 66% of spatial gradients in NDVI across dryland regions, precipitation only accounts for <26% of temporal NDVI variability over most (>75%) dryland regions. We observed this weaker temporal relative to spatial relationship between NDVI and precipitation across all global drylands. We confirmed this result using three alternative water availability metrics that account for water loss to evaporation, and growing season and precipitation timing. This suggests that predicting vegetation responses to future rainfall using space‐for‐time substitution will strongly overestimate precipitation control on interannual variability in aboveground growth. We explore multiple mechanisms to explain the discrepancy between spatial and temporal responses and find contributions from multiple factors including local‐scale vegetation characteristics, climate and soil properties. Earth system models (ESMs) from the latest Coupled Model Intercomparison Project overestimate the observed vegetation sensitivity to precipitation variability up to threefold, particularly during dry years. Given projections of increasing meteorological drought, ESMs are likely to overestimate the impacts of future drought on dryland vegetation with observations suggesting that dryland vegetation is more resistant to annual precipitation variations than ESMs project.
    Keywords Biological Sciences ; arid lands ; climate ; climate change ; drought ; evaporation ; normalized difference vegetation index ; rain ; vegetation
    Language English
    Dates of publication 2021-09
    Size p. 4367-4380.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.15729
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 6338: Show issues

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