Spatial Variation of Sea-Spray Fluxes over a Mediterranean Coastal Zone Using a Sea-State Model

Piazzola, Jacques; Forget, Philippe; Lafon, Christine; Despiau, S.

doi:10.1007/s10546-009-9386-2

Cited by 29 publications

(17 citation statements)

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“…This seasonal behavior could be attributed to a higher wildland fire activity and long-range transport from the Eastern Europe in spring and summer [76]. There are also higher rainfalls in fall and winter, which cause washout and wet depositions of aerosol [77,78]. Similarly, the maximum seasonal values of α 440−870 are observed in spring (with a mean value of 1.11 ± 0.36) and summer (1.20 ± 0.36), while minimum values are observed in fall (1.08 ± 0.41) and winter (1.07 ± 0.47).…”

Section: Assessment Of Sacor Performancesmentioning

confidence: 99%

Atmospheric Correction of Multi-Spectral Littoral Images Using a PHOTONS/AERONET-Based Regional Aerosol Model

et al. 2017

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Spatial resolution is the main instrumental requirement for the multi-spectral optical space missions that address the scientific issues of marine coastal systems. This spatial resolution should be at least decametric. Aquatic color data processing associated with these environments requires specific atmospheric corrections (AC) suitable for the spectral characteristics of high spatial resolution sensors (HRS) as well as the high range of atmospheric and marine optical properties. The objective of the present study is to develop and demonstrate the potential of a ground-based AC approach adaptable to any HRS for regional monitoring and security of littoral systems. The in Situ-based Atmospheric CORrection (SACOR) algorithm is based on simulations provided by a Successive Order of Scattering code (SOS), which is constrained by a simple regional aerosol particle model (RAM). This RAM is defined from the mixture of a standard tropospheric and maritime aerosol type. The RAM is derived from the following two processes. The first process involved the analysis of a 6-year data set composed of aerosol optical and microphysical properties acquired through the ground-based PHOTONS/AERONET network located at Arcachon (France). The second process was related to aerosol climatology using the NOAA hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) model. Results show that aerosols have a bimodal particle size distribution regardless of the season and are mainly represented by a mixed coastal continental type. Furthermore, the results indicate that aerosols originate from both the Atlantic Ocean (53.6%) and Continental Europe (46.4%). Based on these results, absorbing biomass burning, urban-industrial and desert dust particles have not been considered although they represent on average 19% of the occurrences. This represents the main current limitation of the RAM. An assessment of the performances of SACOR is then performed by inter-comparing the water-leaving reflectance (ρ w ) retrievals with three different AC methods (ACOLITE, MACCS and 6SV using three different standard aerosol types) using match-ups (N = 8) composed of Landsat-8/Operational Land Imager (OLI) scenes and field radiometric measurements. Results indicate consistency with the SWIR-based ACOLITE method, which shows the best performance, except in the green channel where SACOR matches well with the in-situ data (relative error of 7%). In conclusion, the study demonstrates the high potential of the SACOR approach for the retrieval of ρ w . In the future, the method could be improved by using an adaptive aerosol model, which may select the most relevant local aerosol model following the origin of the atmospheric air mass, and could be applied to the latest HRS (Sentinel-2/MSI, SPOT6-7, Pleiades 1A-1B).

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Section: Assessment Of Sacor Performancesmentioning

confidence: 99%

Atmospheric Correction of Multi-Spectral Littoral Images Using a PHOTONS/AERONET-Based Regional Aerosol Model

et al. 2017

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“…Total concentrations recorded for major species are reported in Table 1. For low offshore winds, anthropogenic tracers such as NH 4 + , nss-SO 4 2-and NO 3 -showed concentrations in the range of those already measured in the northern Mediterranean during the FETCH experiment (Sellegri et al [18]). However, it seems that sulphate concentrations measured at Porquerolles are rather low compared to those acquired during eastern Mediterranean measurements in the Aegean Sea by Eleftheriadis et al [19] and in the coastal site of Finokalia by Bardouki et al [20], i.e., 10.12 ± 1.10 µg m -3 and 6.88 ± 0.96 µg m -3 , respectively.…”

Section: Chemical Analysismentioning

confidence: 66%

“…This is mainly due to the heterogeneous spatial and temporal distribution of tropospheric aerosol particles, their different origins (natural or anthropogenic), and their physical and chemical transformation in the free troposphere. In marine areas, the sea-sprays generated at the air-sea interface by wave breaking represent a major component of the natural aerosol mass (Andreae [1]; Yoon et al [2]; Piazzola et al [3]) and therefore are important in the Earth radiative budget (e.g., Mulcahy et al [4]). In addition, they have a significant influence on the coastal urban air quality (Knipping and Dabdub [5]) through their ability to have chemical and physical interactions with other aerosol species and gases and then sea-spray aerosols transport a large variety of organic matter (Paerl et al [6]).…”

Section: Introductionmentioning

confidence: 99%

Transport of aerosols in the Mediterranean coastal zone

Piazzola¹,

Demoisson²,

Tedeschi³

2013

WIT Transactions on Ecology and the Environment

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Aerosol particles in coastal areas result from a complex mixing between seaspray aerosols locally generated at the sea surface by breaking waves and a continental component arising from natural and/or anthropogenic sources. We present a study on the aerosol transport in a French Mediterranean coastal zone based on physico-chemical characterization of the particle size distributions measured on the island of Porquerolles. The results are analyzed using a 2D model, the MACMod model, dedicated to the aerosol transport at a local scale. A part of the analysis deals with the dispersion of organic compounds in the Marine Boundary Layer (MABL). This shows that, even at very short fetch, the seaspray particles represent a strong contribution of the aerosol size distributions measured in the coastal zone. In contrast, the low wind speed conditions correspond to air masses that are strongly impacted by pollution transported over the Mediterranean. Under higher wind speed conditions, aerosol number and mass concentrations of smaller sizes are lowered due to the dispersion of anthropogenic pollutants. However, the model simulations show that the lifetime of these submicronic particles in the atmosphere, which are characteristics of the anthropogenic influence in coastal areas, is rather large.

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“…de Leeuw et al (2000) proposed an SGF model based on their observations performed near a surf zone. Piazzola et al (2002Piazzola et al ( , 2009) also quantified the amount of film and jet droplets in a coastal area by focusing on the change in whitecap coverage under a short fetch condition. The size and number of spray droplets in a coastal area, however, are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Relationship between latent heat of sea spray and uncertainty of a meteorological field

Saruwatari

Abe

2014

Applied Ocean Research

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A surf zone with large breaking waves produces more spray than do offshore regions. Latent heat of spray evaporation causes change in the surrounding temperature and wind velocity, resulting in further alterations in temperature, wind velocity and heat flux. Spray in a surf zone with large breaking waves may have unignorable effect on determination of a local meteorological field because of this interconnected relationship as well as its higher population than in the open ocean. In this study, the effects of the spray latent heat on a meteorological field were investigated. The authors propose a method for estimating latent heat of spray vaporization over the ocean. The method was applied to a meso-scale meteorological model to perform numerical experiments with consideration of heat flux by spray. Although the contribution of heat flux on the ocean was as small as 2.5%, fluctuations of air temperature and wind velocity increased over time due to the effects of spray. The fluctuations are thought to cause uncertainty in weather prediction. Numerical experiments with spray provided predictions of air temperature and wind velocity near a coast line that were consistent with observational data, especially when the population of spray droplets increased by two orders of magnitude as is often observed in a coastal area.

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Spatial Variation of Sea-Spray Fluxes over a Mediterranean Coastal Zone Using a Sea-State Model

Cited by 29 publications

References 50 publications

Atmospheric Correction of Multi-Spectral Littoral Images Using a PHOTONS/AERONET-Based Regional Aerosol Model

Atmospheric Correction of Multi-Spectral Littoral Images Using a PHOTONS/AERONET-Based Regional Aerosol Model

Transport of aerosols in the Mediterranean coastal zone

Relationship between latent heat of sea spray and uncertainty of a meteorological field

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