Relationship between wind speed and aerosol optical depth over remote ocean

Huang, Hao; Thomas, G. E.; Grainger, R. G.

doi:10.5194/acp-10-5943-2010

Cited by 40 publications

(42 citation statements)

References 39 publications

(37 reference statements)

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“…This results from the low dependency of τ c on W (e.g. ROI e) and from narrow range of very low winds (less the 2% of the wind measurements Huang et al (2010) are lower than 2 m/s). The small variability of τ c at low winds, allows us to identify a background aerosol (τ c0 , marked by the horizontal line in Fig.…”

Section: Analysis and Resultsmentioning

confidence: 99%

Estimating the maritime component of aerosol optical depth and its dependency on surface wind speed using satellite data

et al. 2010

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Abstract. Six years (2003Six years ( -2008 of satellite measurements of aerosol parameters from the Moderate Resolution Imaging Spectroradiometer (MODIS) and surface wind speeds from Quick Scatterometer (QuikSCAT), the Advanced Microwave Scanning Radiometer (AMSR-E), and the Special Sensor Microwave Imager (SSM/I), are used to provide a comprehensive perspective on the link between surface wind speed and marine aerosol optical depth over tropical and subtropical oceanic regions. A systematic comparison between the satellite derived fields in these regions allows to: (i) separate the relative contribution of wind-induced marine aerosol to the aerosol optical depth; (ii) extract an empirical linear equation linking coarse marine aerosol optical depth and wind intensity; and (iii) identify a time scale for correlating marine aerosol optical depth and surface wind speed. The contribution of wind induced marine aerosol to aerosol optical depth is found to be dominated by the coarse mode elements. When wind intensity exceeds 4 m/s, coarse marine aerosol optical depth is linearly correlated with the surface wind speed, with a remarkably consistent slope of 0.009±0.002 s/m. A detailed time scale analysis shows that the linear correlation between the fields is well kept within a 12 h time frame, while sharply decreasing when the time lag between measurements is longer. The background aerosol optical depth, associated with aerosols that are not produced in-situ through wind driven processes, can be used for estimating the contributions of terrestrial and biogenic marine aerosol to over-ocean satellite retrievals of aerosol optical depth.

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Section: Analysis and Resultsmentioning

confidence: 99%

Estimating the maritime component of aerosol optical depth and its dependency on surface wind speed using satellite data

et al. 2010

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“…Some studies suggest a linear relationship [32][33][34][35], while others a power-law relationship [14,36,37] or an exponential relationship [38]. The discrepancy between different relationships is probably attributed to different instrumentations, platforms, locations and periods used in the investigations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wind Speed on Moderate Resolution Imaging Spectroradiometer (MODIS) Aerosol Optical Depth over the North Pacific

et al. 2018

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Abstract:The surface-wind speed influences on aerosol optical depth (AOD), derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua daily observations over the central North Pacific during the period 2003-2016, have been investigated in this study. The cloud coverage is relatively low over the present investigation area compared to other marine areas, which favors AOD derived from passive remote sensing from space. In this study, we have combined MODIS AOD with 2 m wind speed (U 2m ) on a satellite-pixel basis, which has been interpolated from National Centers for Environmental Prediction (NCEP) reanalysis. In addition, daily averaged AOD derived from Aerosol Robotic Network (AERONET) measurements in the free-troposphere at the Mauna Loa Observatory (3397 m above sea level), Hawaii, was subtracted from the MODIS column AOD values. The latter was to reduce the contribution of aerosols above the planetary boundary layer. This study shows relatively strong power-law relationships between MODIS mean AOD and surface-wind speed for marine background conditions in summer, fall and winter of the current period. However, previous established relationships between AOD and surface-wind speed deviate substantially. Even so, for similar marine conditions the present relationship agrees reasonable well with a power-law relationship derived for north-east Atlantic conditions. The present MODIS retrievals of AOD in the marine atmosphere agree reasonably well with ground-based remote sensing of AOD.

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“…There is a good spatial correlation between the two, although AATSR retrieves lower AOD (typically 0.02-0.1) than MODIS (typically 0.07-0.2). Elevated AOD in open ocean regions in both correspond to higher aerosol loadings from windier conditions; although various relationships between wind speed and marine AOD have been proposed (for example, recently Smirnov et al, 2003, Glantz et al, 2009Huang et al, 2009;Lehahn et al, 2010), all suggest higher winds lead to higher AOD.…”

Section: Intercomparison Of Aerosol Optical Depthmentioning

confidence: 99%

A sea surface reflectance model for (A)ATSR, and application to aerosol retrievals

2010

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Abstract.A model of the sea surface bidirectional reflectance distribution function (BRDF) is presented for the visible and near-IR channels (over the spectral range 550 nm to 1.6 µm) of the dual-viewing Along-Track Scanning Radiometers (ATSRs). The intended application is as part of the Oxford-RAL Aerosols and Clouds (ORAC) retrieval scheme. The model accounts for contributions to the observed reflectance from whitecaps, sun-glint and underlight. Uncertainties in the parametrisations used in the BRDF model are propagated through into the forward model and retrieved state. The new BRDF model offers improved coverage over previous methods, as retrievals are possible into the sunglint region, through the ATSR dual-viewing system. The new model has been applied in the ORAC aerosol retrieval algorithm to process Advanced ATSR (AATSR) data from September 2004 over the south-eastern Pacific. The assumed error budget is shown to be generally appropriate, meaning the retrieved states are consistent with the measurements and a priori assumptions. The resulting field of aerosol optical depth (AOD) is compared with colocated MODIS-Terra observations, AERONET observations at Tahiti, and cruises over the oceanic region. MODIS and AATSR show similar spatial distributions of AOD, although MODIS reports values which are larger and more variable. It is suggested that assumptions in the MODIS aerosol retrieval algorithm may lead to a positive bias in MODIS AOD of order 0.01 at 550 nm over ocean regions where the wind speed is high.

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Relationship between wind speed and aerosol optical depth over remote ocean

Cited by 40 publications

References 39 publications

Estimating the maritime component of aerosol optical depth and its dependency on surface wind speed using satellite data

Estimating the maritime component of aerosol optical depth and its dependency on surface wind speed using satellite data

Effect of Wind Speed on Moderate Resolution Imaging Spectroradiometer (MODIS) Aerosol Optical Depth over the North Pacific

A sea surface reflectance model for (A)ATSR, and application to aerosol retrievals

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