Air temperature estimation with MODIS data over the Northern Tibetan Plateau
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Time series of MODIS land surface temperature (T s) and normalized difference vegetation index (NDVI) products, combined with digital elevation model (DEM) and meteorological data from 2001 to 2012, were used to map the spatial distribution of monthly mean air temperature over the Northern Tibetan Plateau (NTP). A time series analysis and a regression analysis of monthly mean land surface temperature (T s) and air temperature (T a) were conducted using ordinary linear regression (OLR) and geographical weighted regression (GWR). The analyses showed that GWR, which considers MODIS T s, NDVI and elevation as independent variables, yielded much better results [R2 Adj > 0.79; root-mean-square error (RMSE) = 0.51°C–1.12°C] associated with estimating T a compared to those from OLR (R 2 Adj = 0.40−0.78; RMSE = 1.60°C–4.38°C). In addition, some characteristics of the spatial distribution of monthly T a and the difference between the surface and air temperature (T d) are as follows. According to the analysis of the 0°C and 10°C isothermals, T a values over the NTP at elevations of 4000–5000 m were greater than 10°C in the summer (from May to October), and T a values at an elevation of 3200 m dropped below 0°C in the winter (from November to April). T a exhibited an increasing trend from northwest to southeast. Except in the southeastern area of the NTP, T d values in other areas were all larger than 0°C in the winter.
Key wordsair temperature estimation MODIS land surface temperature geographical weighted regression Northern Tibetan Plateau
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This study was funded by the Chinese Academy of Science “Hundred Talents” program (Dr. Weiqiang MA), the National Natural Science Foundation of China (Grant Nos. 41375009, 91337212, 41275010 and 41522501 and 41661144043), Study on long term changes of surface heat source in northern Tibetan Plateau and its thermal effect on the plateau monsoon system (Dr. Zeyong HU; Grant No. 91537101), the China Meteorological Administration Special Fund for Scientific Research in the Public Interest (Grant No. GYHY201406001), and the EU-FP7 project “CORECLIMAX” (Grant No. 313085).
- He, J., and K. Yang, 2011: China meteorological forcing dataset. Cold and Arid Regions Science Data Center at Lanzhou, doi: 10.3972/westdc.002.2014.db. (in Chinese)Google Scholar
- Huang, F. F., W. Q. Ma, M. S. Li, and Y. M. Ma, 2016: Analysis on responses of land surface temperature on the Northern Tibetan Plateau to climate change. Plateau Meteorology, 35, 55–63. (in Chinese with English abstract)Google Scholar
- IPCC, 2013: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Stocker et al., Eds., Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 1535 pp, doi: 10.1017/CBO9781107415324.Google Scholar
- Li, M. S., Y. M. Ma, W. Q. Ma, H. Ishikawa, F. L. Sun, and S.-Y. Ogino, 2011: Structural difference of atmospheric boundary layer between dry and rainy seasons over the Central Tibetan Plateau. Journal of Glaciology and Geocryology, 33, 72–79. (in Chinese with English abstract)Google Scholar
- Li, S. D., and G. D. Cheng, 1996: Map of Frozen Ground on Qinghai-Xizang Plateau. Lanzhou: Gansu Culture Press. (in Chinese)Google Scholar
- Ma, Y. M., T. D. Yao, J. M. Wang, Z. Y. Hu, H. Ishikawa, W. Q. Ma, M. Menenti, and Z. B. Su, 2006a: The study on the land surface heat fluxes over heterogeneous landscape of the Tibetan Plateau. Advances in Earth Science, 21, 1215–1223. (in Chinese with English abstract)Google Scholar
- Ma, Y. M., L. Zhong, Z. B. Su, H. Ishikawa, M. Menenti, and T. Koike, 2006b: Determination of regional distributions and seasonal variations of land surface heat fluxes from Landsat-7 Enhanced Thematic Mapper data over the central Tibetan Plateau area. J. Geophys. Res.-Atmos., 111, D10305, doi: 10.1029/2005JD006742.CrossRefGoogle Scholar
- Ren, G. Y., Y. Y. Ren, Q. X. Li, and W. H. Xu, 2014: An overview on global land surface air temperature change. Advances in Earth Science, 29, 934–946. (in Chinese with English abstract)Google Scholar
- Ren, Y., X. Q. Zhang, and L. L. Peng, 2010: Construction and analysis of mean air temperature anomaly series for the Qinghai-Xizang Plateau during 1951–2006. Plateau Meteorology, 29, 572–578. (in Chinese with English abstract)Google Scholar
- Yao, Y. H., and B. P. Zhang, 2013: MODIS-based estimation of air temperature and heating-up effect of the Tibetan Plateau. Acta Geographica Sinica, 68, 95–107. (in Chinese with English abstract)Google Scholar