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Titolo:
AIRBORNE REMOTE-SENSING OF TROPOSPHERIC WATER-VAPOR WITH A NEAR-INFRARED DIFFERENTIAL ABSORPTION LIDAR SYSTEM
Autore:
EHRET G; KIEMLE C; RENGER W; SIMMET G;
Indirizzi:
GERMAN AEROSP RES ESTAB,INST ATMOSPHER PHYS D-82230 OBERPFAFFENHOFEN GERMANY
Titolo Testata:
Applied optics
fascicolo: 24, volume: 32, anno: 1993,
pagine: 4534 - 4551
SICI:
0003-6935(1993)32:24<4534:AROTWW>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
720-NM WAVELENGTH REGION; RAMAN LIDAR; SPECTROSCOPY; PROFILES; LASER; SENSITIVITY; LINES; ARGON;
Keywords:
LIDAR; DIFFERENTIAL ABSORPTION LIDAR (DIAL); WATER VAPOR; DYE LASER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
G. Ehret et al., "AIRBORNE REMOTE-SENSING OF TROPOSPHERIC WATER-VAPOR WITH A NEAR-INFRARED DIFFERENTIAL ABSORPTION LIDAR SYSTEM", Applied optics, 32(24), 1993, pp. 4534-4551

Abstract

A near-infrared airborne differential absorption lidar (DIAL) system has become operational. Horizontal and vertical water vapor profiles of the troposphere during summer (nighttime) conditions extending from the top of the planetary boundary layer (PBL) up to near the tropopause are investigated. These measurements have been performed in SouthernBavaria, Germany. The system design, the frequency control units, andan estimation of the laser line profile of the narrow-band dye laser are discussed Effective absorption cross sections in terms of altitudeare calculated. Statistical and systematic errors of the water vapor measurements are evaluated as a function of altitude. The effect of a systematic range-dependent error caused by molecular absorption is investigated by comparing the DIAL data with in situ measurements. Typical horizontal resolutions range from 4 km in the lower troposphere to 11 km in the upper troposphere, with vertical resolutions varying from 0.3 to 1 km, respectively. The lower limit of the sensitivity of the water vapor mixing ratio is calculated to be 0.01 g/kg. The total errors of these measurements range between 8% and 25%. A sine-shaped wave structure with a wavelength of 14 km and an amplitude of 20% of its mean value, detected in the lower troposphere, indicates an atmospheric gravity wave field.

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Documento generato il 24/11/20 alle ore 14:38:17