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Title: Intermittency in Precipitation: Duration, Frequency, Intensity, and Amounts Using Hourly Data

Abstract

Intermittency is a core characteristic of precipitation, not well described by data and very poorly modeled. Detailed analyses are made of near-global gridded (about 1°) hourly or 3-hourly precipitation rates from two updated observational datasets [3-hourly TRMM 3B42, version 7, and hourly CMORPH, version 1.0, bias corrected (CRT)] and from special runs of CESM from January 1998 to December 2013 to obtain hourly values. The analyses explore the intermittency of precipitation: the frequency, intensity, duration, and amounts. A comparison is made for all products using several metrics with a focus on the duration of events, and a new metric is proposed based on the ratio of the frequency of precipitation at certain rates (0.2–2 mm h −1 ) for hourly versus 3-hourly versus daily data. For all seasons and rain rates, TRMM values are similar in pattern to CMORPH, but durations are about 80%–85%. It is mainly over land in the monsoons that CMORPH exceeds TRMM rain durations. Observed duration of precipitation events in CMORPH over oceans are 12–15 h in the tropics and subtropics, much less than the ~20 h for CESM. Hence, the observational results differ somewhat but both are considerably different from the model, which has toomore » much precipitation overall, and it precipitates far too often at low rates and not enough for intense rates, with the divide about 1–2 mm h −1 . There is a need to properly represent precipitation phenomena and processes either explicitly or implicitly (parameterized).« less

Authors:
 [1];  [1];  [2]
  1. National Center for Atmospheric Research, Boulder, Colorado
  2. CIRES, University of Colorado, Boulder, Boulder, Colorado
Publication Date:
Research Org.:
National Center for Atmospheric Research, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1352111
Alternate Identifier(s):
OSTI ID: 1537028
Grant/Contract Number:  
SC0012711
Resource Type:
Published Article
Journal Name:
Journal of Hydrometeorology
Additional Journal Information:
Journal Name: Journal of Hydrometeorology Journal Volume: 18 Journal Issue: 5; Journal ID: ISSN 1525-755X
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Hydrologic cycle; Precipitation; Rainfall; Hydrometeorology; Coupled models; Model errors

Citation Formats

Trenberth, Kevin E., Zhang, Yongxin, and Gehne, Maria. Intermittency in Precipitation: Duration, Frequency, Intensity, and Amounts Using Hourly Data. United States: N. p., 2017. Web. doi:10.1175/JHM-D-16-0263.1.
Trenberth, Kevin E., Zhang, Yongxin, & Gehne, Maria. Intermittency in Precipitation: Duration, Frequency, Intensity, and Amounts Using Hourly Data. United States. doi:10.1175/JHM-D-16-0263.1.
Trenberth, Kevin E., Zhang, Yongxin, and Gehne, Maria. Mon . "Intermittency in Precipitation: Duration, Frequency, Intensity, and Amounts Using Hourly Data". United States. doi:10.1175/JHM-D-16-0263.1.
@article{osti_1352111,
title = {Intermittency in Precipitation: Duration, Frequency, Intensity, and Amounts Using Hourly Data},
author = {Trenberth, Kevin E. and Zhang, Yongxin and Gehne, Maria},
abstractNote = {Intermittency is a core characteristic of precipitation, not well described by data and very poorly modeled. Detailed analyses are made of near-global gridded (about 1°) hourly or 3-hourly precipitation rates from two updated observational datasets [3-hourly TRMM 3B42, version 7, and hourly CMORPH, version 1.0, bias corrected (CRT)] and from special runs of CESM from January 1998 to December 2013 to obtain hourly values. The analyses explore the intermittency of precipitation: the frequency, intensity, duration, and amounts. A comparison is made for all products using several metrics with a focus on the duration of events, and a new metric is proposed based on the ratio of the frequency of precipitation at certain rates (0.2–2 mm h −1 ) for hourly versus 3-hourly versus daily data. For all seasons and rain rates, TRMM values are similar in pattern to CMORPH, but durations are about 80%–85%. It is mainly over land in the monsoons that CMORPH exceeds TRMM rain durations. Observed duration of precipitation events in CMORPH over oceans are 12–15 h in the tropics and subtropics, much less than the ~20 h for CESM. Hence, the observational results differ somewhat but both are considerably different from the model, which has too much precipitation overall, and it precipitates far too often at low rates and not enough for intense rates, with the divide about 1–2 mm h −1 . There is a need to properly represent precipitation phenomena and processes either explicitly or implicitly (parameterized).},
doi = {10.1175/JHM-D-16-0263.1},
journal = {Journal of Hydrometeorology},
number = 5,
volume = 18,
place = {United States},
year = {2017},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1175/JHM-D-16-0263.1

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Cited by: 14 works
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Works referencing / citing this record:

Climate change impact on the hydrological budget of a large Mediterranean island
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Climate change impact on the hydrological budget of a large Mediterranean island
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