noaa’s climate prediction center & *environmental modeling center camp springs, md 20746

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NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746 Impact of High-Frequency Variability of Soil Moisture on Seasonal Precipitation Song Yang, S.-H. Yoo R. Yang*, K. Mitchell*, H. van den Dool, and R. W. Higgins Table of Contents Motivation Model and experiments Results, explanations, & summary Future work

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Impact of High-Frequency Variability of Soil Moisture on Seasonal Precipitation. Song Yang, S.-H. Yoo R. Yang*, K. Mitchell*, H. van den Dool, and R. W. Higgins. NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746. Table of Contents. Motivation - PowerPoint PPT Presentation

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Page 1: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

NOAA’s Climate Prediction Center &*Environmental Modeling Center

Camp Springs, MD 20746

Impact of High-Frequency Variability of Soil Moisture on Seasonal Precipitation

Song Yang, S.-H. Yoo

R. Yang*, K. Mitchell*, H. van den Dool, and R. W. Higgins

Table of Contents

Motivation

Model and experiments

Results, explanations, & summary

Future work

Page 2: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Yang and Lau (1998; J. Climate)

Motivation

Page 3: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

NCEP Eta Regional Climate ModelResolution: 32-km in horizontal; 45 levels in verticalDomain: 10N-90N, 164W-58W

Noah Land Model 2.3, with 4 soil layersImplemented in Operational NCEP Eta ModelImplemented in NCEP Regional Reanalysis

Boundary conditions: NCEP/NCAR Global Reanalysis Initial conditions: NCEP/NCAR Global Reanalysis U.S. Air Force daily analysis of snow depthInitial land states: NCEP Regional Reanalysis

Model

Page 4: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Period: May-August of 1988 and 1993Starting months: AprilLength of integrations: 4 monthsNumber of ensemble members: 5SST, surface albedo, and greenness: Updated daily

Data of verifications: NCEP Regional Reanalysis; NCEP Land Data Assimilation System; CPC Unified Precipitation; and Global Telecommunications

Experiments

Soil moisture as surface boundary forcing in sensitivity experiments:3-hourly meansDaily meansWeekly means

Page 5: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Results I: Control Runs

Model-observation comparison

Page 6: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Precipitation (1993-1988)

Eta

RR CPC

Page 7: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Surface Temperature (1993-1988)

Eta

RR GTS

Page 8: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Page 9: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Soil Moisture (1993-1988)

LDAS data from Dr. Yun Fan

Page 10: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Results II: Sensitivity Experiments

Soil moisture as surface boundary forcing:3-hourly means

Daily meansWeekly means

Roles of diurnal cycle & sub-synoptic variability of soil moisture

Page 11: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

JJA 1988Precip

3 Hourly

3H-Daily

3H-Weekly

Ts

Page 12: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

TsJJA 1988T850

3 Hourly

3H-Daily

3H-Weekly

Page 13: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

850-mb Winds

JJA 1988

3H-Weekly

3H-Daily

3 Hourly

Page 14: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Precip of JJA 1988 Precip of JJA 1993

3 Hourly

3H-Daily

3H-Weekly

3H-Weekly

Page 15: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Ts of JJA 1988 Ts of JJA 1993

3 Hourly

3H-Daily

3H-Weekly

Page 16: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

T850 of JJA 1988 T850 of JJA 1993

3 Hourly

3H-Daily

3H-Weekly

Page 17: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

JJA 1988

JJA 1993

3 Hourly

3H-Daily

3H-Weekly

Page 18: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Explanations

Page 19: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Page 20: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Page 21: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

Page 22: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

• Reasonable performance by Eta

• Impact of sub-synoptic soil moisture variability

• HF var. of soil moisture changes seasonal means of precip.

• Different roles between 1988 and 1993

• Importance of diurnal cycle

• Dynamical consistence

• Explanation (water and heat fluxes, instability, etc.)

Summary

Page 23: NOAA’s Climate Prediction Center & *Environmental Modeling Center Camp Springs, MD 20746

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