A modeling study of iodine chemistry in the marine boundary layer

被引:219
作者
McFiggans, G [1 ]
Plane, JMC
Allan, BJ
Carpenter, LJ
Coe, H
O'Dowd, C
机构
[1] Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England
[2] Univ Manchester, Inst Sci & Technol, Atmospher Sci Grp, Dept Phys, Manchester M60 1QD, Lancs, England
[3] Univ Sunderland, Ctr Marine & Atmospher Sci, Sunderland SR2 7BW, England
关键词
D O I
10.1029/1999JD901187
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
An observationally constrained photochemical bos model has been developed to investigate the atmospheric chemistry of iodine in the marine boundary layer, motivated by recent measurements of the iodine monoxide (IO) radical (Allan et al., this issue). Good agreement with the time series of IO measured at a midlatitude coastal station was achieved by using a reaction scheme that included recycling of iodine through marine aerosol. The strong diurnal variation in IO observed in the subtropical Atlantic was satisfactorily modeled by assuming a constant concentration of iodocarbons that photolyzed to produce roughly 1 x 10(4) iodine atoms cm(-3) s(-1) at midday. The significance of the occurrence of IO at concentrations of up to 4 parts per trillion in the marine boundary layer was then considered from three angles. First, the iodine-catalyzed destruction of ozone was shown to be of a magnitude similar to that caused by odd-hydrogen photochemistry, with up to 13% of the available ozone destroyed per day in a marine air mass. Second, the enrichment factor of iodine in marine aerosol compared with surface seawater was predicted to increase to values of several thousand, in sensible accord with observations. Most of the enrichment should be due to the accumulation of iodate, although other iodine species may also be present, depending on the rate of aerosol recycling. Third, the denoxification of the marine boundary layer was found to be significantly enhanced as a result of aerosol uptake of IONO2, formed from the recombination of IO with NO2.
引用
收藏
页码:14371 / 14385
页数:15
相关论文
共 61 条
[1]   Iodine oxide in the marine boundary layer [J].
Alicke, B ;
Hebestreit, K ;
Stutz, J ;
Platt, U .
NATURE, 1999, 397 (6720) :572-573
[2]  
[Anonymous], 1986, NUMERICAL RECIPES C
[3]   EVALUATED KINETIC AND PHOTOCHEMICAL DATA FOR ATMOSPHERIC CHEMISTRY SUPPLEMENT-IV - IUPAC SUBCOMMITTEE ON GAS KINETIC DATA EVALUATION FOR ATMOSPHERIC CHEMISTRY [J].
ATKINSON, R ;
BAULCH, DL ;
COX, RA ;
HAMPSON, RF ;
KERR, JA ;
TROE, J .
JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA, 1992, 21 (06) :1125-1568
[4]   FOURIER-TRANSFORM IR SPECTROSCOPIC OBSERVATION OF GASEOUS NITROSYL IODINE, NITRYL IODINE, AND IODINE NITRATE [J].
BARNES, I ;
BECKER, KH ;
STARCKE, J .
JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (24) :9736-9740
[5]   Short-lived alkyl iodides and bromides at Mace Head, Ireland: Links to biogenic sources and halogen oxide production [J].
Carpenter, LJ ;
Sturges, WT ;
Penkett, SA ;
Liss, PS ;
Alicke, B ;
Hebestreit, K ;
Platt, U .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1999, 104 (D1) :1679-1689
[6]   Observations of the nitrate radical in the free troposphere at Izana de Tenerife [J].
Carslaw, N ;
Plane, JMC ;
Coe, H ;
Cuevas, E .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1997, 102 (D9) :10613-10622
[7]   Simultaneous observations of nitrate and peroxy radicals in the marine boundary layer [J].
Carslaw, N ;
Carpenter, LJ ;
Plane, JMC ;
Allan, BJ ;
Burgess, RA ;
Clemitshaw, KC ;
Coe, H ;
Penkett, SA .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1997, 102 (D15) :18917-18933
[8]   Modeling OH, HO2, and RO2 radicals in the marine boundary layer -: 1.: Model construction and comparison with field measurements [J].
Carslaw, N ;
Creasey, DJ ;
Heard, DE ;
Lewis, AC ;
McQuaid, JB ;
Pilling, MJ ;
Monks, PS ;
Bandy, BJ ;
Penkett, SA .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1999, 104 (D23) :30241-30255
[9]   INORGANIC GAS-PHASE REACTIONS OF THE NITRATE RADICAL - I2+NO3 AND I+NO3 [J].
CHAMBERS, RM ;
HEARD, AC ;
WAYNE, RP .
JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (08) :3321-3331
[10]   IODINE - ITS POSSIBLE ROLE IN TROPOSPHERIC PHOTOCHEMISTRY [J].
CHAMEIDES, WL ;
DAVIS, DD .
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1980, 85 (NC12) :7383-7398