Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

21
Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40

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Transcript of Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Page 1: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Vertical diffusion in ERA-40

Dirk Olivié12 November 2003

Vertical diffusion in ERA-40

Page 2: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Overview

• Vertical Diffusion• Louis, Holtslag, ECMW6h

– Kz –profile– Radon distribution– Comparison with measurements

• Ecmwf3h, Ecmwf6h– Radon distribution– Comparison with measurements

Page 3: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

What it’s all about …

z

CK

zt

Cz

Kz : diffusion coefficient [m2s-1]

C : tracer concentration

Page 4: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Overview diffusion data

time step

Louis 6h00 instantaneous

Holtslag 3h00 instantaneous

Ecmwf-6h 6h00 accumulated

Ecmwf-3h 3h00 accumulated

Page 5: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Louis – Holtslag – ECMWF6h

• Kz profile

• Global Radon distribution• Comparison with Radon

measurement– daily cycle– correlation

Page 6: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Kz : mean profile

LouisHoltslagEcmwf-6h

August 1993Global meanOver land

Page 7: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Kz : daily cycleLouisHoltslagEcmwf-6h

4h30 7h30 10h30

13h30 16h30 19h30 21h30

1h30

Page 8: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon : Holtslag - Louis

Page 9: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon : Ecmwf6h - Holtslag

Page 10: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon : Ecmwf6h - Louis

Page 11: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon : SurfaceLouisHoltslagEcmwf-6h

Measurement

Page 12: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon : 1200 m

Louis Ecmwf-6h Measurement Holtslag No diffusion

Page 13: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Correlation : surface

Jan Mar May Jul Sep Nov

LouisHoltslagEcmwf-6h

Page 14: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Correlation : 1200 m

LouisHoltslagEcmwf-6h

Jan Mar May Jul Sep Nov

Page 15: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

ECMWF3h-ECMWF6h

• Global Radon distribution• Daily cycle• Correlation

Page 16: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

ECMWF3h-ECMWF6h

Page 17: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon - Daily cycle - surface

LouisHoltslagEcmwf-6hEcmwf-3hMeasurement

Page 18: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon - Daily cycle – 1200 m

LouisHoltslagEcmwf-6hEcmwf-3hNo diffusionMeasurement

Page 19: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Correlation surface

Jun Jul Aug

LouisHoltslagEcmwf-6hEcmwf-3hNo diffusion

Page 20: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Correlation : 1200 m

LouisHoltslagEcmwf-6hEcmwf-3hNo diffusion

Jun Jul Aug

Page 21: Vertical diffusion in ERA-40 Dirk Olivié 12 November 2003 Vertical diffusion in ERA-40.

Radon profile

LouisHoltslagEcmwf-6hEcmwf-3hNo diffusion


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