Applicability Evaluation of Merged Soil Moisture in GLDAS-NOAH and CLDAS-V2.0 Products over Qinghai-Tibetan Plateau of 2015 Based on TIPEX Ⅲ Observations

CUI Yuanyuan; JING Wenqi; QIN Jun

doi:10.7522/j.issn.1000-0534.2018.00020

2018 , Vol. 37 >Issue 5: 1143 - 1160

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00020

Applicability Evaluation of Merged Soil Moisture in GLDAS-NOAH and CLDAS-V2.0 Products over Qinghai-Tibetan Plateau of 2015 Based on TIPEX Ⅲ Observations

CUI Yuanyuan ,
JING Wenqi ,
QIN Jun

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Hebei Province Meteorological Bureau, Shijiazhuang 050000, Hebei, China;Meteorological Observatory of 94758 Troops, Ningde 352000, Fujian, China;School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China

Received date: 2017-10-20

Online published: 2018-10-28

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Abstract

In-situ soil temperature and soil moisture observations at five layers (5 cm, 10 cm, 20 cm, 50 cm and 100 cm) from the 3rd Qinghai-Tibetan Plateau Atmospheric Scientific Experiment (TIPEX Ⅲ) were used to verify the applicability of two land surface model products, i.e.Global Land Data Assimilation System-NCEP, OSU, Air Force and Office of Hydrology (GLDAS-NOAH) and CMA (China Meteorological Administration) Land Data Assimilation System Version 2.0 (CLDAS-V2.0).This paper calculated the correlation coefficient and deviation between the two land model products and the in-situ soil temperature and soil moisture observations in 2015.In addition, this paper also analyzed the response of the soil temperature and soil moisture products from CLDAS-V2.0 and GLDAS-NOAH.From the two aspects, this study comprehensively evaluated the soil temperature and soil moisture' applicability of the two model products over Qinghai-Tibetan Plateau.Through the above analysis, it is discovered that the correlation (both for soil temperature and soil moisture) between the CLDAS-V2.0 and in-situ observations is better than that of GLDAS-NOAH.The correlation between the land model products (both for CLDAS-V2.0 and GLDAS-NOAH) and in-situ observations in wet season is larger than that in dry season, and shows a decreasing trend with soil depth.The deviation of soil moisture between the CLDAS-V2.0 and in-situ observations is slightly larger than that of GLDAS-NOAH.In addition, in shallow soil layers, the mean relative error (MRE) of soil moisture between the model products (both for CLDAS-V2.0 and GLDAS-NOAH) and in-situ observations during dry season is larger than that of the wet season.The root mean square error (RMSE) between CLDAS-V2.0 soil temperature product and in-situ observations in wet season is larger than that of the dry season, while this inclination of RMSE is opposite for GLDAS-NOAH temperature product during the wet and dry season.Both the CLDAS-V2.0 and GLDAS-NOAH model products can relatively accurate grasp that how the soil temperature and soil moisture response to the precipitation in shallow soil layers.However, the two model products show a lager fluctuation in deep soil layers relative to in-situ observations both in soil temperature and soil moisture.At last, the two model products (CLDAS-V2.0 and GLDAS-NOAH) cannot reproduce the significantly "lag" features that the observed soil temperature and soil moisture show a delayed change with the soil depth.And the daily Peak/valley values appear time of the soil temperature and soil moisture will show a "lag" feature after the precipitation happened which the two model products cannot describe it.

Key words： Qinghai-Tibetan Plat; the 3rd Qinghai-Tibe; merged soil temperat; applicability evalua

Cite this article

CUI Yuanyuan , JING Wenqi , QIN Jun . Applicability Evaluation of Merged Soil Moisture in GLDAS-NOAH and CLDAS-V2.0 Products over Qinghai-Tibetan Plateau of 2015 Based on TIPEX Ⅲ Observations[J]. Plateau Meteorology, 2018 , 37(5) : 1143 -1160 . DOI: 10.7522/j.issn.1000-0534.2018.00020

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