Upward mass fluxes in tropical upper troposphere and lower stratosphere derived from radiative transfer calculations

作者：Lin, L.; Fu, Q.^*; Zhang, H.; Su, J.; Yang, Q.; Sun, Z.

来源：Journal of Quantitative Spectroscopy and Radiative Transfer, 2013, 117: 114-122.

DOI：10.1016/j.jqsrt.2012.11.016

• Vertical velocity
• Upward mass flux
• Tropical upper troposphere
• Tropical lower stratosphere
• Radiative heating rates
• Radiation models
• Line-by-line calculations

Yang et al. [1] quantified vertical velocity and upward mass fluxes in tropical lower stratosphere based on radiative heating rate calculations using the Fu-Liou radiation model along with 8-year Southern Hemisphere Additional Ozonesondes balloon-borne measurements of temperature and ozone and cryogenic frost-point hygrometer measured water vapor. The impact of tropospheric clouds on stratospheric heating rates was considered using cloud distributions from the International Satellite Cloud Climatology Project. Since the radiative heating rate in the lower stratosphere can be as small as 0.1-0.2 K/day, an accurate radiative heating rate calculation including all radiatively active species is required. In this paper, we revisit the calculations in Yang et al. [1] by developing a line-by-line radiative transfer model (LBLRTM-D4S) for multiple scattering atmospheres. We consider the cloud impact using the cloud fields based on active lidar and radar observations from CALIPSO and CloudSat so that the quantification of upward mass fluxes in tropical lower stratosphere can be extended to tropical upper troposphere. The annual mean mass fluxes and vertical velocities from LBLRTM-D4S are similar to 14 kg m(-2) day(-1) and 0.77 mm s(-1), respectively, at 120 hPa (15.5 km), and similar to 1.2 kg m(-2) day(-1) and 0.13 mm s(-1) at 60 hPa (19.5 km). We examine the accuracy of three commonly used efficient radiation models including Fu-Liou, RRTM, and SBDART in estimating tropical upward mass fluxes against the LBLRTM-D4S results.

• 出版日期2013-3
• 单位国家气候中心; 兰州大学