CERES MODIS Cloud Product Retrievals for Edition 4—Part II: Comparisons to CloudSat and CALIPSO
CERES MODIS Cloud Product Retrievals for Edition 4—Part II: Comparisons to CloudSat and CALIPSO
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CERES MODIS 云产品检索第 4 版 - 第 II 部分：与 CloudSat 和 CALIPSO 的比较
DOI：
10.1109/tgrs.2020.3015155
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发表时间：
2021
影响因子：
8.2
通讯作者：
W. Smith
中科院分区：
文献类型：
--
作者：
C. Yost;P. Minnis;S. Sun;Yan Chen;W. Smith
云的评估和地球辐射能系统第4版（Ed 4）云检索是气候研究的关键。使用A-Train星座中的仪器评估Ed 4云参数。云-气溶胶激光雷达与正交偏振（CALIOP）和云廓线雷达（CPR）检索进行了比较，Ed 4检索从水中分辨率成像光谱仪（MODIS）作为CALIOP水平平均（HA）规模的函数。无论HA尺度如何，MODIS白天（夜间）的水云分数（CF）都大于（小于）CALIOP。MODIS冰CF总体上小于CALIOP，在极地地区差异最大。Ed 4和CALIOP在70%-98%的同时观测中检索到相同的云相，这取决于一天中的时间，地面条件，HA尺度和云垂直结构的类型。无雪/无冰表面上单层水云的平均云顶高度（CTH）差异小于100米。170-460 m的基础海拔正偏置可能受到CPR检测限制的影响。平均MODIS冰CTH被低估了70米的一些深对流云和薄卷云高达~2.2公里。冰云底部高度通常在白天（夜间）被低估（高估）。白天和夜间观测的海洋卷云光学厚度分别在46%和5%以内。冰水路径的差异取决于CALIOP检索版本，并保证进一步调查。除了白天卷云光学厚度，Ed 4云属性检索至少与其他长期运行的云属性检索系统一样准确。
Assessments of the Clouds and the Earth’s Radiant Energy System Edition 4 (Ed4) cloud retrievals are critical for climate studies. Ed4 cloud parameters are evaluated using instruments in the A-Train Constellation. Cloud-Aerosol LiDAR with Orthogonal Polarization (CALIOP) and Cloud Profiling Radar (CPR) retrievals are compared with Ed4 retrievals from the Aqua Moderate-Resolution Imaging Spectroradiometer (MODIS) as a function of the CALIOP horizontal averaging (HA) scale. Regardless of the HA scale, MODIS daytime (nighttime) water cloud fraction (CF) is greater (less) than that from CALIOP. MODIS ice CF is less than CALIOP overall, with the largest differences in polar regions. Ed4 and CALIOP retrieve the same cloud phase in 70%–98% of simultaneous observations depending on the time of day, surface conditions, HA scales, and type of cloud vertical structure. Mean cloud top height (CTH) differences for single-layer water clouds over snow-/ice-free surfaces are less than 100 m. Base altitude positive biases of 170–460 m may be impacted by CPR detection limitations. Average MODIS ice CTHs are underestimated by 70 m for some deep convective clouds and up to ~2.2 km for thin cirrus. Ice cloud base altitudes are typically underestimated (overestimated) during daytime (nighttime). MODIS and CALIOP cirrus optical depths over oceans are within 46% and 5% for daytime and nighttime observations, respectively. Ice water path differences depend on the CALIOP retrieval version and warrant further investigation. Except for daytime cirrus optical depth, Ed4 cloud property retrievals are at least as accurate as other long-term operational cloud property retrieval systems.