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- 0e3c8f3e-c229-4760-b81c-fd0150254aaa definition "A deeper understanding of how clouds will respond to a warming climate is one of the outstanding challenges in climate science. Uncertainties in the response of clouds, and particularly shallow clouds, have been identified as the dominant source of the discrepancy in model estimates of equilibrium climate sensitivity. As the community gains a deeper understanding of the many processes involved, there is a growing appreciation of the critical role played by fluctuations in water vapor and the coupling of water vapor and atmospheric circulations. Reduction of uncertainties in cloud-climate feedbacks and convection initiation as well as improved understanding of processes governing these effects will result from profiling of water vapor in the lower troposphere with improved accuracy and vertical resolution compared to existing airborne and spaceborne measurements. NASA/LaRC (Langley Research Center) in Hampton, VA, developed the airborne instrument HALO (High Altitude Lidar Observatory) to address the observational needs of NASA's weather, climate, carbon cycle, and atmospheric composition focus areas. HALO is a multi-function airborne lidar to measure atmospheric H2O and CH4 mixing ratios and aerosol/cloud/ocean optical properties using the DIAL (DIfferential Absorption Lidar) and HSRL (High Spectral Resolution Lidar) techniques, respectively. HALO is designed as an airborne simulator for future space-based greenhouse gas DIAL missions called out by the 2018 Earth Science Decadal Survey and serves as testbed for risk reduction of key technologies required to enable future spaceborne missions. To respond to a wide range of airborne process studies, HALO can be rapidly reconfigured to provide either CH4 DIAL+HSRL, H2O DIAL+HSRL, or CH4 DIAL+H2O DIAL measurements using three different laser transmitters and a single multi-channel and multi-wavelength receiver. This paper will provide an overview of the HALO program including advancements of new laser technologies for airborne and spaceborne measurements of water vapor and methane and preliminary CH4+aerosol measurements from recent airborne test flights." @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa id "1655910" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_id abe7fa55-1198-44ea-8327-20d13155b46c @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_id c8fe757b-b530-4d67-a553-e4903f4430a5 @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_id ec76ff59-7450-48a0-9152-7c3531e609fd @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_label "Active Remote Sensing" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_label "Altimeters" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_label "Earth Remote Sensing Instruments" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_label "Instruments" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa path_label "Lidar/Laser Altimeters" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa prefLabel "HALO" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa reference "https://eoportal.org/web/eoportal/airborne-sensors/halo" @default.
- 0e3c8f3e-c229-4760-b81c-fd0150254aaa tag "Instruments" @default.