Characteristics Of Atmospheric Heat Sources And Impact On Climate Change

Using daily NCEP/NCAR (version 1 and version2) reanalysis dataset, ECMWF reanalysis dataset and GAME reanalysis dataset, we get daily datasets of heat source and find that difference reanalysis dataset adapt to difference regions in Asian summer monsoon area. Then based on daily NCEP/NCAR (version 1) reanalysis dataset for the period 1961-2001, we discuss the interannual variation of cold source over the east of TP in winter and the relationship with atmosphere/ocean. At last using the NCAR CAM3.1, the impact of atmospheric heat source (sink) distribution over Asia and the Southern Hemisphere on East Asian monsoon and Indian monsoon are investigated.(1)Using reverse method, NCEPâ… and ERA adapt to be adopted to calculate heat sources over the tropical region of Asia, except for NCEPâ…¡. However, not ERA but NCEPâ… andâ…¡are available for calculating heat sources over the subtropical and eastern region of China mainland.(2) In winter the colder/warmer air over TP results in the fact that from spring to autumn low-level anomaly north/south winds appear to the east of TP and low-level anomaly zonal west/east winds prevail in the equator. This helps the occurrences of El nino/La nina in the following autumn and winter. The appearance of El nino/La nina produces the stronger/weaker west Pacific subtropical high (WPSH) in the following summer, and this induces the warmer/colder air over TP by weaker/stronger snowfall.(3)The distribution of atmospheric heat source over East Asian region and heat sink over Australia have close relations with East Asian summer monsoon, heating over the East Asian continent and west Pacific can induce the subtropical monsoon system over the Northern Hemisphere (for example the subtropical high), and heating over the South China Sea and cooling over the North Australia are the major mechanism for the tropical Southwestlies monsoon over the South China Sea, the anticyclone over Australia and cross-equatorial flow. Heating over the western part of Asian region and Indian Ocean south of the equator connect with Indian summer monsoon very well, however, the impact on East Asian summer monsoon is weak. Heating over the Bay of Bengal can induce Indian Southwestlies monsoon to extend eastwardly, heating over the subtropical continent is the major mechanism for the subtropical high over the Northern Hemisphere.(4) In January, the cold (heat) source over East Asia and Australia have close relations with East Asian winter monsoon, the diabatic heating over Australia can induce the heat low over the north of Australia, cooling over East Asia is the major mechanism for the cold high over the local region, the major circulation system of East Asian monsoon can be simulated; Secondly, the diabatic heating over the west part of Asian region and Indian ocean south of the equator connect with Indian winter. Monsoon very well. Likewise, there is relationship between this heating and East Asian winter monsoon, in particular, the diabatic heating over the subtropical regions of western Asia can strengthen winter cross-equatorial flow over the South China Sea and adjust the position of Aleutian low.