Assessment of MERRA-2 Land Surface Energy Flux Estimates

Draper, Clara S.; Reichle, Rolf H.; Koster, Randal D.

doi:10.1175/jcli-d-17-0121.1

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Assessment of MERRA-2 Land Surface Energy Flux Estimates

2018
By Draper, Clara S. ; Reichle, Rolf H. ; Koster, Randal D.
Source: Journal of Climate, 31(2), 671-691.

[PDF-4.80 MB]

Details Related Documents You May Also Like

Details:

Journal Title:

Journal of Climate
Personal Author:

Draper, Clara S. ; Reichle, Rolf H. ; Koster, Randal D.

Draper, Clara S. ; Reichle, Rolf H. ; Koster, Randal D. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
Description:

In the Modern-Era Retrospective Analysis for Research and Applications version 2 (MERRA-2) system the land is forced by replacing the model-generated precipitation with observed precipitation before it reaches the surface. This approach is motivated by the expectation that the resultant improvements in soil moisture will lead to improved land surface latent heating (LH). Here aspects of the MERRA-2 land surface energy budget and 2-m air temperatures T-2m are assessed. For global land annual averages, MERRA-2 appears to overestimate the LH (by 5Wm(-2)), the sensible heating (by 6Wm(-2)), and the downwelling shortwave radiation (by 14Wm(-2)) while underestimating the downwelling and upwelling (absolute) longwave radiation (by 10-15Wm(-2) each). These results differ only slightly from those for NASA's previous reanalysis, MERRA. Comparison to various gridded reference datasets over boreal summer (June-August) suggests that MERRA-2 has particularly large positive biases (>20Wm(-2)) where LH is energy limited and that these biases are associated with evaporative fraction biases rather than radiation biases. For time series of monthly means during boreal summer, the globally averaged anomaly correlations Ranom with reference data were improved from MERRA to MERRA-2, for LH (from 0.39 to 0.48 vs Global Land Evaporation Amsterdam Model data) and the daily maximum T-2m (from 0.69 to 0.75 vs Climatic Research Unit data). In regions where T-2m is particularly sensitive to the precipitation corrections (including the central United States, the Sahel, and parts of South Asia), the changes in the T-2m Ranom are relatively large, suggesting that the observed precipitation influenced the T-2m performance.
Source:

Journal of Climate, 31(2), 671-691.
DOI:

https://doi.org/10.1175/jcli-d-17-0121.1
Document Type:

Journal Article
Rights Information:

Other
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:1fe5afa859dc067818f77914170af917d0bafea0a7117b408f3adb92147f6624
Download URL:

https://repository.library.noaa.gov/view/noaa/21549/noaa_21549_DS1.pdf
File Type:

No Additional Files

More +

Assessment of MERRA-2 Land Surface Energy Flux Estimates

Details:

Supporting Files

Related Documents

You May Also Like