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Impact of Land Model Calibration on Coupled Land-Atmosphere Prediction
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Author and Affiliation:
Santanello, Joseph A., Jr.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Kumar, Sujay V.(Science Applications International Corp., McLean, VA, United States);
Peters-Lidard, Christa D.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Harrison, Ken(Maryland Univ., College Park, MD, United States);
Zhou, Shujia(Northrop Grumman Information Systems, Fairfax, VA, United States)
Abstract: Land-atmosphere (L-A) interactions play a critical role in determining the diurnal evolution of both planetary boundary layer (PBL) and land surface heat and moisture budgets, as well as controlling feedbacks with clouds and precipitation that lead to the persistence of dry and wet regimes. Recent efforts to quantify the strength of L-A coupling in prediction models have produced diagnostics that integrate across both the land and PBL components of the system. In this study, we examine the impact of improved specification of land surface states, anomalies, and fluxes on coupled WRF forecasts during the summers of extreme dry and wet land surface conditions in the U.S. Southern Great Plains. The improved land initialization and surface flux parameterizations are obtained through calibration of the Noah land surface model using the new optimization and uncertainty estimation subsystem in NASA's Land Information System (LIS-OPT/UE). The impact of the calibration on the a) spinup of the land surface used as initial conditions, and b) the simulated heat and moisture states and fluxes of the coupled WRF simulations is then assessed. Changes in ambient weather and land-atmosphere coupling are evaluated along with measures of uncertainty propagation into the forecasts. In addition, the sensitivity of this approach to the period of calibration (dry, wet, average) is investigated. Results indicate that the offline calibration leads to systematic improvements in land-PBL fluxes and near-surface temperature and humidity, and in the process provide guidance on the questions of what, how, and when to calibrate land surface models for coupled model prediction.
Publication Date: Jun 21, 2012
Document ID:
20120015684
(Acquired Nov 15, 2012)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Report/Patent Number: GSFC.JA.7120.2012
Document Type: Preprint
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 57p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: AIR LAND INTERACTIONS; ATMOSPHERIC BOUNDARY LAYER; ATMOSPHERIC MODELS; CALIBRATING; CLIMATE MODELS; DIURNAL VARIATIONS; EARTH SURFACE; GREAT PLAINS CORRIDOR (NORTH AMERICA); MATHEMATICAL MODELS; PLANETARY BOUNDARY LAYER; SIMULATION; WEATHER FORECASTING
Miscellaneous Notes: Submitted to Journal of Hydrometeorology
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