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Antarctic waters along the planetary boundary layer aerosol characteristics of water-soluble ions

Author: XuGuoJie
Tutor: ChenLiQi
School: Third Institute of Oceanography of State Oceanic Administration
Course: Marine Chemistry
Keywords: Marine aerosols Soluble ions MSA Antarctic expedition
CLC: X513
Type: Master's thesis
Year: 2011
Downloads: 40
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Abstract


The use of Chinese 25th and 26th Antarctic expedition routes, continuous collection of marine aerosol samples analyzed samples of water-soluble ionic components of the composition and concentration, and the analysis of the sources of the various components. The main results show that: (1) 25th Antarctic expedition routes over the major water-soluble ions in aerosol concentrations were higher than the 26th Antarctic expedition routes; Cl - , Na , SO 4 2 - , NO 3 -, Mg 2 is the main ionic components; sea salt the aerosol particles are the main soluble component, followed by sulphate. (2) In these two Antarctic expedition route, sea salt ion concentration in the south of 40 ° S with high values ??of wind speed and sea salt main ingredient Na , K , Mg < sup> 2 , Ca 2 , Cl - and Br - were significantly positively correlated, that determines the size of sea salt group velocity The size of the concentration, studies show that in the Southern Ocean sea with wind speed increases linearly with increasing salt concentration; For secondary aerosol NH 4 , NO ( 3 -) concentration by terrestrial input a great impact in the coastal waters from land closer with high value; non-salt sulfate (nss-SO 4 2 - ) In the open ocean waters of the Southern Ocean and the concentration were lower, while in the waters of the continental margin higher concentration; methyl sulfonic acid (MSA) with latitude distribution of just the nss-SO 4 2 - Conversely, showing gradually increasing trend from north to south, especially in the 60 ° S in the South China Sea area, studies show that marine primary productivity may be affected MSA concentration distribution is an important factor; according to MSA concentration and MSA / nss-SO 4 2 - good linear correlation between the ratio of resistance and MSA / nss-SO 4 2 - and temperature showed good exponential relationship can be inferred biogenic sulfide contribution of the non-salt sulfate may be controlled by dimethyl sulfide (DMS) oxidation process and the temperatures of these two parameters. (3) in the two Antarctic expedition route there are different levels of chlorine loss phenomenon, in the 25th Antarctic route, chlorine loss at 7.1% 4 4.9% range, while in the 26th Chlorine loss in the Antarctic routes 0.3% 2 4.4% range. (4) Sea Salt main ingredient Na , Mg 2 ion and Cl - , Br - ions are present between significant correlation, indicating their common marine source; secondary aerosol ion nss-SO 4 2 - , NO 3 - and NH 4 are present among a significant positive correlation, indicating that these three ions have a similar origin, may (NH 4 ) 2 SO 4 , NH 4 HSO 4 , NH 4 NO 3 in the form exists. Along the two Antarctic marine aerosols on soluble ion composition can be attributed to marine source pollution (land-based sources) the impact of these two factors, but also the existence of marine biogenic emissions sources on MSA concentration.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Particulate pollutants
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