DIURNAL CYCLES OF FORMIC AND ACETIC-ACIDS IN THE NORTHERN PART OF THE GUAYANA SHIELD, VENEZUELA

被引:61
作者
HARTMANN, WR
SANTANA, M
HERMOSO, M
ANDREAE, MO
SANHUEZA, E
机构
[1] INST VENEZOLANO INVEST CIENTIFICAS,APARTADO 21827,CARACAS 1020A,VENEZUELA
[2] MAX PLANCK INST CHEM,W-6500 MAINZ,GERMANY
关键词
TROPICAL ATMOSPHERE; FORMIC ACID; ACETIC ACID;
D O I
10.1007/BF00048100
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Formic and acetic acids were measured in a scrub-grass savanna and in a nearby semi-deciduous forest. Gaseous HCOOH and CH3COOH were collected using the mist-scrubber technique, and were determined using ion chromatography. A strong diurnal cycle was observed at both sites, with higher mixing ratios during daytime. Concentrations in the savanna were always higher than in the forest. Most of the time HCOOH/CH3COOH ratios greater than one were recorded at the savanna site, and ratios less than one at the forest site. Boundary-layer mixing ratios in the savanna region, derived from measurements during midday, are 1.3 +/- 0.4 ppbv and 0.7 +/- 0.3 ppbv for HCOOH and CH3COOH. Dry depositions velocities between 0.5 and 1 cm s-1 were estimated for the savanna region. Atmospheric residence times of < 3 days and > 5 days were estimated for the rainy and dry season, respectively.
引用
收藏
页码:63 / 72
页数:10
相关论文
共 23 条
[1]   FORMIC AND ACETIC-ACID OVER THE CENTRAL AMAZON REGION, BRAZIL .1. DRY SEASON [J].
ANDREAE, MO ;
TALBOT, RW ;
ANDREAE, TW ;
HARRISS, RC .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1988, 93 (D2) :1616-1624
[2]   PRECIPITATION CHEMISTRY IN CENTRAL AMAZONIA [J].
ANDREAE, MO ;
TALBOT, RW ;
BERRESHEIM, H ;
BEECHER, KM .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1990, 95 (D10) :16987-16999
[3]  
AYERS GP, 1988, SCOPE, V36, P347
[4]   AQUEOUS-PHASE SOURCE OF FORMIC-ACID IN CLOUDS [J].
CHAMEIDES, WL ;
DAVIS, DD .
NATURE, 1983, 304 (5925) :427-429
[5]   IMPROVED AQUEOUS SCRUBBER FOR COLLECTION OF SOLUBLE ATMOSPHERIC TRACE GASES [J].
COFER, WR ;
COLLINS, VG ;
TALBOT, RW .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1985, 19 (06) :557-560
[6]   DRY DEPOSITION OF OZONE - SOME MEASUREMENTS OF DEPOSITION VELOCITY AND OF VERTICAL PROFILES TO 100-METRES [J].
COLBECK, I ;
HARRISON, RM .
ATMOSPHERIC ENVIRONMENT, 1985, 19 (11) :1807-1818
[7]   THE COMPOSITION OF PRECIPITATION IN REMOTE AREAS OF THE WORLD [J].
GALLOWAY, JN ;
LIKENS, GE ;
KEENE, WC ;
MILLER, JM .
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1982, 87 (NC11) :8771-8786
[8]  
GARLAND JA, 1979, Q J ROY METEOR SOC, V105, P169, DOI 10.1002/qj.49710544311
[9]   RAINWATER ACIDITY AT JABIRU, AUSTRALIA, IN THE WET SEASON OF 1983/84 [J].
GILLETT, RW ;
AYERS, GP ;
NOLLER, BN .
SCIENCE OF THE TOTAL ENVIRONMENT, 1990, 92 :129-144
[10]  
GRAEDEL T E, 1988, Tellus Series B Chemical and Physical Meteorology, V40, P335