Observationally constrained analysis of sea salt aerosol in the marine atmosphere
Observationally constrained analysis of sea salt aerosol in the marine atmosphere
复制标题
海洋大气中海盐气溶胶的观测约束分析
DOI：
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发表时间：
2018
影响因子：
6.3
通讯作者：
A. Smirnov
中科院分区：
文献类型：
--
作者：
H. Bian;K. Froyd;D. Murphy;J. Dibb;A. Darmenov;M. Chin;P. Colarco;Arlindo M. da Silva;T. Kucsera;G. Schill;Hongbin Yu;P. Bui;M. Dollner;B. Weinzierl;A. Smirnov
抽象的。大气海盐在海洋云的形成中起着重要作用，
大气化学我们对NASA GEOS进行了综合分析，
使用GOCART气溶胶模块进行模型模拟，使用美国航天局ATom活动期间获得的PALMS和佐贺仪器进行现场测量，使用AERONET海洋气溶胶网络和中分辨率成像光谱仪卫星观测进行气溶胶光学厚度测量，以更好地限制海洋大气中的海盐。ATom测量和GEOS模型模拟都表明，太平洋和大西洋的海盐浓度有很强的垂直梯度，从海洋边界层到自由对流层的变化高达4个数量级。模拟的停留时间表明，干直径小于3 µm的海盐颗粒的寿命主要受湿法去除和湍流过程的控制。在北方夏季和冬季，地球观测系统模拟的海盐质量混合比同意佐贺测量在海洋边界层（MBL）和PALMS测量以上的MBL。然而，AOD从GEOS与AERONET/MAN和MODIS气溶胶反演的比较表明，该模型低估了AOD的海洋海盐占主导地位。略微高估的浓度和大大低估的AOD的明显差异不能用影响颗粒吸湿增长的模型RH中的偏差来解释，因为发现模型RH
与原位测量相当或大于原位测量。这一难题至少可以部分地由海盐粒度分布的差异来解释; GEOS模拟在较小的粒度范围内具有少得多的海盐粒度，因此与PALMS观察到的相比，消光效率较低。
Abstract. Atmospheric sea salt plays important roles in marine cloud formation and
atmospheric chemistry. We performed an integrated analysis of NASA GEOS
model simulations run with the GOCART aerosol module, in situ measurements from the PALMS and SAGA instruments obtained during the NASA ATom campaign, and aerosol optical depth (AOD) measurements from the AERONET Marine Aerosol Network (MAN) and from MODIS satellite observations to better constrain sea salt in the marine atmosphere. ATom measurements and GEOS model simulations both show that sea salt concentrations over the Pacific and Atlantic oceans have a strong vertical gradient, varying up to 4 orders of magnitude from the marine boundary layer to free troposphere. The modeled residence times suggest that the lifetime of sea salt particles with a dry diameter of less than 3 µm is largely controlled by wet removal, followed by turbulent process. During both boreal summer and winter, the GEOS-simulated sea salt mass mixing ratios agree with SAGA measurements in the marine boundary layer (MBL) and with PALMS measurements above the MBL. However, comparison of AOD from GEOS with AERONET/MAN and MODIS aerosol retrievals indicated that the model underestimated AOD over the oceans where sea salt dominates. The apparent discrepancy of slightly overpredicted concentration and large underpredicted AOD could not be explained by biases in the model RH affecting the particle hygroscopic growth, as modeled RH was found to be
comparable to or larger than the in situ measurements. This conundrum could at least partially be explained by the difference in sea salt size distribution; the GEOS simulation has much less sea salt percentage-wise in the smaller particle size range and thus less efficient light extinction than what was observed by PALMS.
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影响因子：
6.3
作者：
Browse, J.;Carslaw, K. S.;Leck, C.
通讯作者：
Leck, C.
影响因子：
6.3
作者：
Bian, Huisheng;Chin, Mian;Tsyro, Svetlana G.
通讯作者：
Tsyro, Svetlana G.
海洋一次气溶胶排放对海面温度依赖性的模型研究
影响因子：
6.3
作者：
Barthel;van Pinxteren
通讯作者：
van Pinxteren
海冰作为格陵兰冰芯海盐气溶胶的来源：基于模型的研究
DOI：
10.5194/acp-2017-100
发表时间：
2017
期刊：
--
影响因子：
--
作者：
Rhodes R
通讯作者：
Rhodes R