Effects of water vapor fluctuations on atmospheric limb radiance structure

Carine Quang; Valérie Rialland; Antoine Roblin

doi:10.1117/12.866879

26 October 2010 Effects of water vapor fluctuations on atmospheric limb radiance structure

Carine Quang, Valérie Rialland, Antoine Roblin

Proceedings Volume 7827, Remote Sensing of Clouds and the Atmosphere XV; 78270L (2010) https://doi.org/10.1117/12.866879
Event: SPIE Remote Sensing, 2010, Toulouse, France

Abstract

Airborne infrared limb-viewing sensors may be used as surveillance devices in order to detect dim military targets. These systems' performances are limited by the inhomogeneous background in the sensor field of view which impacts strongly on target detection probability. Consequently, the knowledge of the radiance small-scale angular fluctuations and their statistical properties is required to assess the sensors' detection capacity. In the stratosphere and in clear-sky conditions, the structured background is mainly due to inertia-gravity-wave and turbulence-induced temperature and density spatial fluctuations. Moreover, in the particular case of water vapor absorption bands, the mass fraction fluctuations play a non negligible role on the radiative field. Thereby, considering as a first approximation the temperature field and the water vapor field as stationary stochastic processes, the radiance autocorrelation function (ACF) can be expressed as a function of the temperature ACF and the water vapor mass fraction ACF. This paper presents the model developed to compute the two-dimensional radiance angular ACF. This model requires the absorption coefficients and their temperature derivatives, which were calculated by a line-by-line code dedicated to water vapor absorption bands. An analytical model was also developed for a simple homogeneous case, in order to validate the average values and the radiance fluctuation variance. The numerical model variance and variance distribution are also compared to SAMM2 outputs, the AFRL radiance structure computation code. The influence of water vapor fluctuations on radiance fluctuations is also discussed.

Citation Download Citation

Carine Quang, Valérie Rialland, and Antoine Roblin "Effects of water vapor fluctuations on atmospheric limb radiance structure", Proc. SPIE 7827, Remote Sensing of Clouds and the Atmosphere XV, 78270L (26 October 2010); https://doi.org/10.1117/12.866879

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Absorption

Sensors

Atmospheric modeling

Target detection

Infrared radiation

Infrared sensors

Stratosphere

Show All Keywords

Keywords/Phrases

Search In:

Publication Years