Ocean Emission Effects on Aerosol‐Cloud Interactions:  Insights from Two Case Studies

Sorooshian, Armin; Duong, H. T.

doi:10.1155/2010/301395

Cited by 12 publications

(6 citation statements)

References 97 publications

(87 reference statements)

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“…During the same cruise, high CCN activity has been documented by Mochida et al []. Earlier studies also documented an enhanced CCN activity over the open ocean waters during high biological activity [ Korhonen et al , ; Meskhidze and Nenes, , ; Sorooshian et al , ; Sorooshian and Duong , ; Vallina et al , ]. Although we do not have the size distribution data of diacids in the present cruise, previous study has shown that the size‐segregated molecular distribution of oxalic acid and other low molecular weight diacids are enriched in the fine mode particles [ Miyazaki et al , ].…”

Section: Resultsmentioning

confidence: 47%

High abundances of oxalic, azelaic, and glyoxylic acids and methylglyoxal in the open ocean with high biological activity: Implication for secondary OA formation from isoprene

Bikkina

Kawamura

Miyazaki

et al. 2014

Geophysical Research Letters

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Atmospheric dicarboxylic acids (DCA) are a ubiquitous water-soluble component of secondary organic aerosols (SOA), which can act as cloud condensation nuclei (CCN), affecting the Earth's climate. Despite the high abundances of oxalic acid and related compounds in the marine aerosols, there is no consensus on what controls their distributions over the open ocean. Marine biological productivity could play a role in the production of DCA, but there is no substantial evidence to support this hypothesis. Here we present latitudinal distributions of DCA, oxoacids and α-dicarbonyls in the marine aerosols from the remote Pacific. Their concentrations were found several times higher in more biologically influenced aerosols (MBA) than less biologically influenced aerosols. We propose isoprene and unsaturated fatty acids as sources of DCA as inferred from significantly higher abundances of isoprene-SOA tracers and azelaic acid in MBA. These results have implications toward the reassessment of climate forcing feedbacks of marine-derived SOA.

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Section: Resultsmentioning

confidence: 47%

High abundances of oxalic, azelaic, and glyoxylic acids and methylglyoxal in the open ocean with high biological activity: Implication for secondary OA formation from isoprene

Bikkina

Kawamura

Miyazaki

et al. 2014

Geophysical Research Letters

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“…The NWP, NAT, and CAT regions are oceanic regions located downwind of the major dust and industrial pollution sources. Thus, these oceanic regions are substantially influenced by the mixture of ocean emissions, the ship exhaust, and the transported continental emissions (Sorooshian and Duong, 2010). It is apparent the CALIOP assimilation over the maritime downwind regime has the most efficient improvements among the four regimes.…”

Section: Comparison Of the Analysis With Caliopmentioning

confidence: 99%

Investigating the assimilation of CALIPSO global aerosol vertical observations using Four-Dimensional Ensemble Kalman Filter

Cheng¹,

Dai²,

Goto³

et al. 2019

Preprint

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<p><strong>Abstract.</strong> The aerosol vertical information is critical to quantify the influences of the aerosol on the climate and environment, however large uncertainties still persist in model simulations. In this study, the vertical aerosol extinction coefficients from Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) onboard Cloud&#8211;Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) are assimilated to optimize the hourly aerosol fields of the Non&#8208;hydrostatic ICosahedral Atmospheric Model (NICAM) online coupled with the Spectral Radiation Transport Model for Aerosol Species (SPRINTARS) using the four-dimensional Local Ensemble Transform Kalman Filter (4D-LETKF). Additionally, a parallel assimilation experiment using the bias-corrected Aerosol Optical Thicknesses (AOTs) from the Moderate Resolution Imaging Spectroradiometer (MODIS) is conducted to investigate the effects of assimilating the observations whether including the vertical information on the model performances. The assimilation experiments are successfully performed for a one-month long, making it possible to evaluate the results in a statistical sense. The hourly analyses are validated via both the CALIOP observed aerosol vertical extinction coefficients and the AOT observations from the MODIS and AErosol RObotic NETwork (AERONET). Our results reveal both the CALIOP and MODIS assimilations can improve the model simulations. The CALIOP assimilation is superior to the MODIS assimilation in modifying the incorrect aerosol vertical distributions and reproducing the real magnitudes and variations. However, the MODIS assimilation can better reproduce the AOT distributions than the CALIOP assimilation. This is probably due to the nadir-viewing CALIOP has much sparser coverages than the MODIS. The assimilation efficiencies of CALIOP decrease with the increasing distances of the overpass time, indicating that more aerosol vertical observation platforms are required to fill the sensor-specific observation gaps and hence improve the aerosol vertical data assimilation.</p>

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“…The emissions from oceans could mix with ship and continental emissions and form a complicated mixture of marine aerosol particles. Thus, the sources and properties of marine aerosols can be affected by ocean emissions, ship exhaust, and transported continental emissions [ Sorooshian and Duong , ]. Here we choose three oceanic regions, and their seasonal vertical profiles of aerosol extinction are shown in Figure .…”

Section: Seasonal Variation Of the Vertical Distribution Of Aerosol Pmentioning

confidence: 99%

Seasonal and diurnal variations of aerosol extinction profile and type distribution from CALIPSO 5‐year observations

et al. 2013

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[1] The new Level 3 aerosol profile data derived from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) provide a multiyear global aerosol distribution with high vertical resolution. We analyzed seasonal and diurnal variations of the vertical distributions of aerosol properties represented by 5-year CALIPSO data. Results show that dust, smoke, and polluted dust are the most frequently detected aerosol types during all seasons. Dust is the dominant type, especially in the middle to upper troposphere, over most areas during boreal spring and summer, while smoke and polluted dust tend to dominate during biomass burning seasons. The seasonal variations of dust layer top height and dust contribution to all-aerosol extinction are positively correlated with the seasonal variation of the dust occurrence frequency. The seasonal cycle of aerosol properties over west Australia is similar to that over biomass burning regime areas, despite its desert regime. In general, smoke is detected more frequently from the lower to middle troposphere; clean marine and polluted continental aerosols are detected more frequently, while polluted dust is detected less frequently, in the lower troposphere during nighttime than daytime. The all-aerosol extinction is generally larger, and the aerosol layer top is detected at high altitudes more frequently during nighttime than daytime. The diurnal changes of aerosol properties are similar within the same aerosol regime. Dust extinction shows little diurnal variation except when dust is the dominant aerosol type. The results contribute to an initial global 3-D aerosol climatology which will likely be extended and improved in the future.

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Ocean Emission Effects on Aerosol‐Cloud Interactions: Insights from Two Case Studies

Cited by 12 publications

References 97 publications

High abundances of oxalic, azelaic, and glyoxylic acids and methylglyoxal in the open ocean with high biological activity: Implication for secondary OA formation from isoprene

High abundances of oxalic, azelaic, and glyoxylic acids and methylglyoxal in the open ocean with high biological activity: Implication for secondary OA formation from isoprene

Investigating the assimilation of CALIPSO global aerosol vertical observations using Four-Dimensional Ensemble Kalman Filter

Seasonal and diurnal variations of aerosol extinction profile and type distribution from CALIPSO 5‐year observations

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