Abstract Present study estimates the shortwave radiative effects of absorbing aerosols (dust and carbonaceous aerosols) over the Indian landmass using a synergy of spaceborne and ground-based observations. Vertical profiles of dust and total aerosols are estimated using the multi-year (2006–2017) observations from CALIOP (Cloud Aerosol Lidar with Orthogonal Polarization) over the Indian region. Pre-monsoon enhancement (March ‐ –May) in aerosol loading over the Indian region is significantly contributed (~56%) by the transported mineral dust at free tropospheric altitudes. Though, shortwave radiative effect due to dust in the atmosphere increases about three times from winter to pre-monsoon, at the top of the atmosphere (TOA) it causes cooling. Dust induced cooling reverses the positive radiative effect induced by non-dust aerosols at TOA over Indo-Gangetic Plains. Though the natural dust dominates the aerosol loading during pre-monsoon, anthropogenic dust contributes significantly (~65%) to the total dust loading during winter. Over Indo-Gangetic Plains, high aerosol warming (up to ~2 Kday−1) observed within the planetary boundary layer (PBL) is mainly caused by carbonaceous aerosols (85%). The observed heating rates over the Indian region can have significant implications over regional climate, air quality, and changing precipitation patterns.

中文翻译：

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使用星载 LIDAR 和地面观测评估南亚特定气溶胶吸收的垂直分布

摘要 本研究利用星载和地面观测的协同作用，估计吸收气溶胶（尘埃和碳质气溶胶）在印度陆地上的短波辐射效应。灰尘和总气溶胶的垂直剖面是使用 CALIOP（具有正交偏振的云气溶胶激光雷达）在印度地区的多年（2006-2017 年）观测资料估算的。印度地区气溶胶载荷的季风前增强（3 月 - 至 5 月）主要是由自由对流层高度的矿物尘埃输送（~56%）造成的。虽然，从冬季到季风前夕，大气中灰尘引起的短波辐射效应增加了大约三倍，但在大气顶部 (TOA) 会导致冷却。粉尘引起的冷却逆转了印度-恒河平原上 TOA 的非粉尘气溶胶引起的正辐射效应。虽然自然灰尘在季风前的气溶胶载荷中占主导地位，但人为灰尘对冬季总灰尘载荷的贡献显着（~65%）。在印度恒河平原上，在行星边界层 (PBL) 内观察到的高气溶胶变暖（高达 ~2 Kday−1）主要是由碳质气溶胶（85%）引起的。在印度地区观测到的升温速率可能对区域气候、空气质量和不断变化的降水模式产生重大影响。在行星边界层 (PBL) 内观察到的高气溶胶变暖（高达 ~2 Kday-1）主要是由碳质气溶胶（85%）引起的。在印度地区观测到的升温速率可能对区域气候、空气质量和不断变化的降水模式产生重大影响。在行星边界层 (PBL) 内观察到的高气溶胶变暖（高达 ~2 Kday-1）主要是由碳质气溶胶（85%）引起的。在印度地区观测到的升温速率可能对区域气候、空气质量和不断变化的降水模式产生重大影响。