Clear-sky closure studies of lower tropospheric aerosol and water vapor during ACE-2 using airborne sunphotometer, airborne in-situ, space-borne, and ground-based measurements

被引:78
作者
Schmid, B
Livingston, JM
Russell, PB
Durkee, PA
Jonsson, HH
Collins, DR
Flagan, RC
Seinfeld, JH
Gassó, S
Hegg, DA
Öström, E
Noone, KJ
Welton, EJ
Voss, KJ
Gordon, HR
Formenti, P
Andreae, MO
机构
[1] Bay Area Environm Res Inst, San Francisco, CA USA
[2] SRI Int, Menlo Pk, CA 94025 USA
[3] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
[4] USN, Postgrad Sch, Monterey, CA USA
[5] CALTECH, Pasadena, CA 91125 USA
[6] Univ Washington, Seattle, WA 98195 USA
[7] Stockholm Univ, Inst Meteorol, S-10691 Stockholm, Sweden
[8] Univ Miami, Miami, FL 33152 USA
[9] Max Planck Inst Chem, D-55128 Mainz, Germany
来源
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY | 2000年 / 52卷 / 02期
关键词
D O I
10.1034/j.1600-0889.2000.00009.x
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
We report on clear-sky column closure experiments (CLEARCOLUMN) performed in the Canary Islands during the second Aerosol Characterization Experiment (ACE-2) in June/July 1997. We present CLEARCOLUMN results obtained by combining airborne sunphotometer and in-situ (optical particle counter, nephelometer, and absorption photometer) measurements taken aboard the Pelican aircraft, space-borne NOAA/AVHRR data and ground-based lidar and sunphotometer measurements. During both days discussed here, vertical profiles flown in cloud-free air masses revealed 3 distinctly different layers: a marine boundary layer (MBL) with varying pollution levels, an elevated dust layer, and a very clean layer between the MBL and the dust layer. A key result of this study is the achievement of closure between extinction or layer aerosol optical depth (AOD) computed from continuous in-situ aerosol size-distributions and composition and those measured with the airborne sunphotometer. In the dust, the agreement in layer AOD (lambda = 380 1060 nm) is 3-8%. In the MBL there is a tendency for the in-situ results to be slightly lower than the sunphotometer measurements (10 17% at lambda = 525 nm), but those differences are within the combined error bars of the measurements and computations.
引用
收藏
页码:568 / 593
页数:26
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