affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Peking University, affiliation not provided to SSRN, Chinese Academy of Meteorological Sciences, Northwest Agricultural and Forestry University, affiliation not provided to SSRN, University of Bonn, affiliation not provided to SSRN, Northwest Agricultural and Forestry University, Northwest Agricultural and Forestry University and Northwest Agriculture and Forestry University