Many multidecadal atmospheric reanalysis products are available now, but their consistencies and reliability are far from perfect. Solar Energy Technologies Office China Postdoctoral Science Foundation National Natural Science Foundation of China (NSFC) Special Fund for Tibetan Plateau Research OSTI Identifier: 1612558 Alternate Identifier(s): OSTI ID: 1560174 Grant/Contract Number: SC0016438 2018M641912 41790472 GYHY201406001 Resource Type: Journal Article: Accepted Manuscript Journal Name: Journal of Geophysical Research: Atmospheres Additional Journal Information: Journal Volume: 124 Journal Issue: 12 Journal ID: ISSN 2169-897X Publisher: American Geophysical Union Country of Publication: United States Language: English Subject: 54 ENVIRONMENTAL SCIENCES 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY sensible heat flux Tibetan Plateau reanalysis data sets wind speed land‐air temperature = , Publication Date: Research Org.: Iowa State Univ., Ames, IA (United States) Sponsoring Org.: USDOE Office of Science (SC), Basic Energy Sciences (BES) USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Inst. Fudan Univ., Shanghai (China) Chinese Academy of Sciences (CAS), Beijing (China).Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) of Information Science and Technology (China). Cornell Univ., Ithaca, NY (United States).However, the root causes of the long-term variability in SH as manifest in the reanalysis products are not consistent with inferences derived from the observations. The intercomparison shows that ERA-Interim exhibits greatest accord with observations in terms of the climatological distribution and seasonality, and all reanalyses exhibit some aspects of the temporal variability and long-term trends as manifest in the observations. Declines in SH prior to 2000 as manifest in the observations appears to have resulted from changes in wind speeds, and the subsequent recovery is attributable to increases in both wind speeds and air-surface temperature gradients. In the climatological mean, SH from observations increases from east to west and exhibits obvious seasonality with highest value in spring and lowest in winter. Spatiotemproal variability in SH over central and eastern TP (CETP) from reanalysis products (i.e., JRA55, ERA-Interim, NCEP1, and NCEP2) and derived using bulk transfer approximations applied to observations is characterized for all seasons during 1980–2015 and is diagnosed in the context of two important drivers of variability: wind speed and land-air temperature difference (Tg-Ta). Surface sensible heat fluxes (SH) over Tibetan Plateau (TP) dictate the seasonal conversion, onset and maintenance of the Asian monsoon.
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