Examining the relationship between intermediate scale soil moisture and terrestrial evaporation within a semi-arid grassland

Handle URI:
http://hdl.handle.net/10754/618014
Title:
Examining the relationship between intermediate scale soil moisture and terrestrial evaporation within a semi-arid grassland
Authors:
Jana, Raghavendra Belur ( 0000-0001-8113-1990 ) ; Ershadi, Ali ( 0000-0002-8885-1947 ) ; McCabe, Matthew ( 0000-0002-1279-5272 )
Abstract:
Interactions between soil moisture and terrestrial evaporation affect water cycle behaviour and responses between the land surface and the atmosphere across scales. With strong heterogeneities at the land surface, the inherent spatial variability in soil moisture makes its representation via point-scale measurements challenging, resulting in scale-mismatch when compared to coarser-resolution satellite-based soil moisture or evaporation estimates. The Cosmic Ray Soil Moisture Observing System (COSMOS) was developed to address such issues in the measurement and representation of soil moisture at intermediate scales. Here we present an examination of the links observed between COSMOS soil moisture retrievals and evaporation estimates over a pasture in the semi-arid central-west region of New South Wales, Australia. The COSMOS soil moisture product was compared to evaporation derived from three distinct approaches, including the Priestley-Taylor (PT-JPL), Penman-Monteith (PM-Mu) and Surface Energy Balance System (SEBS) models, driven by forcing data from local meteorological station data and remote sensing retrievals from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor. Pearson’s Correlations, Quantile-Quantile (Q-Q) plots, and Analysis of Variance (ANOVA) were used to qualitatively and quantitatively evaluate the temporal distributions of soil moisture and evaporation over the study site. The relationships were examined against nearly two years of observation data, as well as for different seasons and for defined periods of analysis. Results highlight that while direct correlations of raw data were not particularly instructive, the Q-Q plots and ANOVA illustrate that the root-zone soil moisture represented by the COSMOS measurements and the modelled evaporation estimates reflect similar distributions under most meteorological conditions. The PT-JPL and PM-Mu model estimates performed contrary to expectation when high soil moisture and cold temperatures were present, while SEBS model estimates displayed a disconnect from the soil moisture distribution in summers with long dry spells. Importantly, no single evaporation model matched the statistical distribution of the measured soil moisture for the entire period, highlighting the challenges in effectively capturing evaporative flux response within changing landscapes.
KAUST Department:
Water Desalination & Reuse Research Cntr; Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
Examining the relationship between intermediate scale soil moisture and terrestrial evaporation within a semi-arid grassland 2016:1 Hydrology and Earth System Sciences Discussions
Journal:
Hydrology and Earth System Sciences Discussions
Issue Date:
17-May-2016
DOI:
10.5194/hess-2016-186
Type:
Article
ISSN:
1812-2116
Sponsors:
Research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The COSMOS instrument was supported by the Commonwealth Scientific and Industry Research Organization (CSIRO). Instrumentation at the Baldry site was funded and commissioned as part of the Australian government’s National Collaborative Research Infrastructure Strategy (NCRIS) and the University of New South Wales. Dr Ershadi was supported by the Australian Research Council Discovery Project (DP120104718).
Additional Links:
http://www.hydrol-earth-syst-sci-discuss.net/hess-2016-186/
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorJana, Raghavendra Beluren
dc.contributor.authorErshadi, Alien
dc.contributor.authorMcCabe, Matthewen
dc.date.accessioned2016-08-07T10:31:06Z-
dc.date.available2016-08-07T10:31:06Z-
dc.date.issued2016-05-17-
dc.identifier.citationExamining the relationship between intermediate scale soil moisture and terrestrial evaporation within a semi-arid grassland 2016:1 Hydrology and Earth System Sciences Discussionsen
dc.identifier.issn1812-2116-
dc.identifier.doi10.5194/hess-2016-186-
dc.identifier.urihttp://hdl.handle.net/10754/618014-
dc.description.abstractInteractions between soil moisture and terrestrial evaporation affect water cycle behaviour and responses between the land surface and the atmosphere across scales. With strong heterogeneities at the land surface, the inherent spatial variability in soil moisture makes its representation via point-scale measurements challenging, resulting in scale-mismatch when compared to coarser-resolution satellite-based soil moisture or evaporation estimates. The Cosmic Ray Soil Moisture Observing System (COSMOS) was developed to address such issues in the measurement and representation of soil moisture at intermediate scales. Here we present an examination of the links observed between COSMOS soil moisture retrievals and evaporation estimates over a pasture in the semi-arid central-west region of New South Wales, Australia. The COSMOS soil moisture product was compared to evaporation derived from three distinct approaches, including the Priestley-Taylor (PT-JPL), Penman-Monteith (PM-Mu) and Surface Energy Balance System (SEBS) models, driven by forcing data from local meteorological station data and remote sensing retrievals from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor. Pearson’s Correlations, Quantile-Quantile (Q-Q) plots, and Analysis of Variance (ANOVA) were used to qualitatively and quantitatively evaluate the temporal distributions of soil moisture and evaporation over the study site. The relationships were examined against nearly two years of observation data, as well as for different seasons and for defined periods of analysis. Results highlight that while direct correlations of raw data were not particularly instructive, the Q-Q plots and ANOVA illustrate that the root-zone soil moisture represented by the COSMOS measurements and the modelled evaporation estimates reflect similar distributions under most meteorological conditions. The PT-JPL and PM-Mu model estimates performed contrary to expectation when high soil moisture and cold temperatures were present, while SEBS model estimates displayed a disconnect from the soil moisture distribution in summers with long dry spells. Importantly, no single evaporation model matched the statistical distribution of the measured soil moisture for the entire period, highlighting the challenges in effectively capturing evaporative flux response within changing landscapes.en
dc.description.sponsorshipResearch reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The COSMOS instrument was supported by the Commonwealth Scientific and Industry Research Organization (CSIRO). Instrumentation at the Baldry site was funded and commissioned as part of the Australian government’s National Collaborative Research Infrastructure Strategy (NCRIS) and the University of New South Wales. Dr Ershadi was supported by the Australian Research Council Discovery Project (DP120104718).en
dc.language.isoenen
dc.relation.urlhttp://www.hydrol-earth-syst-sci-discuss.net/hess-2016-186/en
dc.rightsArchived with thanks to Hydrology and Earth System Sciences Discussions. This work is distributed under the Creative Commons Attribution 3.0 License.en
dc.titleExamining the relationship between intermediate scale soil moisture and terrestrial evaporation within a semi-arid grasslanden
dc.typeArticleen
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalHydrology and Earth System Sciences Discussionsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorJana, Raghavendra Beluren
kaust.authorErshadi, Alien
kaust.authorMcCabe, Matthewen
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