Kar J, Vaughan M, Tackett J, Liu Z, Omar A, Rodier S, Trepte C, Lucker P
Science Systems and Applications Inc., Hampton, VA.
NASA Langley Research Center, Hampton, VA.
Remote Sens Environ. 2018 Jun 15;211:105-111. doi: 10.1016/j.rse.2018.03.043. Epub 2018 Apr 13.
We use the recently released Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) Version 4.1 (V4) lidar data to study the smoke plumes transported from Southern African biomass burning areas. Significant improvements in the CALIPSO V4 Level 1 calibration and V4 Level 2 algorithms lead to a better representation of their optical properties, with the aerosol subtype improvements being particularly relevant to smoke over this area. For the first time, we show evidence of smoke particles increasing in size, evidenced in their particulate color ratios, as they are transported over the South Atlantic Ocean from the source regions over Southern Africa. We hypothesize that this is due to hygroscopic swelling of the smoke particles and is reflected in the higher relative humidity in the middle troposphere for profiles with smoke. This finding may have implications for radiative forcing estimates over this area and is also relevant to the ORACLES field mission.
我们使用最近发布的云和气溶胶激光雷达及红外探路者卫星观测（CALIPSO）4.1版（V4）激光雷达数据，来研究从南部非洲生物质燃烧区域传输而来的烟雾羽流。CALIPSO V4一级校准和V4二级算法的显著改进，使其光学特性得到了更好的呈现，其中气溶胶亚型的改进对于该区域上空的烟雾尤为重要。我们首次发现，当烟雾颗粒从南部非洲的源区经南大西洋传输时，其颗粒颜色比显示出烟雾颗粒尺寸增大的证据。我们推测，这是由于烟雾颗粒的吸湿膨胀所致，并且在有烟雾的垂直剖面中，对流层中部较高的相对湿度也反映了这一点。这一发现可能会对该区域的辐射强迫估计产生影响，并且与ORACLES野外考察任务也相关。
