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Developing a Cal/Val Plan* for a Space-based Doppler Wind Lidar

This project aims to develop a comprehensive calibration and validation plan for future space-based Doppler Wind Lidar (DWL) instruments. The plan includes pre-launch evaluation, post-launch validation, instrument performance models, comparisons with ground-based DWLs, airborne DWL facility, and comparisons with conventional wind observing systems.

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Developing a Cal/Val Plan* for a Space-based Doppler Wind Lidar

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  1. Developing a Cal/Val Plan* for a Space-based Doppler Wind Lidar G. D. Emmitt WG on Space-based Lidar Winds Oxnard, CA 7-9 February, 2001 * funded by the IPO

  2. Purpose • IPO (NOAA, DoD, NASA) interested in having a major role in the Cal/Val of any future space-based DWL • Includes pre-selection/pre-launch evaluation of proposed candidate instruments and observing strategies for space-based DWLs • Primary focus is on post-launch calibration/validation of DWL performance

  3. Components • Instrument performance models (LOS) • OSSEs/OSEs • Ground-based DWLs • Airborne DWL facility • Comparisons of opportunity (COOs)

  4. Instrument Performance Models • Community ensemble of LOS models for DWLs of various transmitting, detection and signal processing technologies • instrument sub-system characterization • atmospheric characterization of the illuminated volume along a LOS • error budgets for LOS measurements (instrument, platform, signal processing…)

  5. OSSEs/OSEs • Pre-launch use of OSEs and OSSEs to establish tradespace for requirements and impacts • Pre-launch use of OSSEs to develop optimal strategies for assimilating DWL data • Pre-launch evaluation of specific proposed DWL concepts • Post-launch verification of expected impact (cal/val of OSSEs???)

  6. Ground-based DWLs • Multi-organization set of DWLs operating from fixed or mobile (vans, trailers) platforms. • NASA, NOAA, DoD, International partners, Universities, Corporations • Advantage: similar illuminated volume and measurement perspective; long term operations • Disadvantage: challenge to co-sight space-based and ground-based systems (frequently)

  7. Airborne DWL Facility • Pre-launch evaluation/development of DWL instruments, observation strategies and data product utilization with a space-based perspective • Cloud effects • Ocean environment • Over-sampling experiments in complex situations • Post-launch “truth” for evaluating instrument performance and data products under conditions not appropriate for ground-based DWLs

  8. Comparisons of Opportunity • Comparison of DWL data products with with those from “conventional” wind observing systems. • 10s of thousands of comparisons per day in many synoptic and geographical situations • Develops empirical relationships between a new data product and the more familiar (to NWP) ones • Accelerates adjusting data assimilation algorithms to optimize the use of new data

  9. Related Activities • Theoretical basis for extracting m from comparisons with “validation observations” • include synoptic stratification • Ground-based and airborne studies of the representativeness of cloud returns of the cloud free winds in proximity • Laboratory and field experiments with controlled conditions to develop better algorithms for signal processing

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