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Vertical diffusion in ERA-40. Vertical diffusion in ERA-40. Dirk Olivié 12 November 2003. Overview. Vertical Diffusion Louis, Holtslag, ECMW6h K z –profile Radon distribution Comparison with measurements Ecmwf3h, Ecmwf6h Radon distribution Comparison with measurements.

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Vertical diffusion in era 40

Vertical diffusion in ERA-40

Vertical diffusion in ERA-40

Dirk Olivié

12 November 2003


Overview
Overview

  • Vertical Diffusion

  • Louis, Holtslag, ECMW6h

    • Kz –profile

    • Radon distribution

    • Comparison with measurements

  • Ecmwf3h, Ecmwf6h

    • Radon distribution

    • Comparison with measurements


What it s all about
What it’s all about …

Kz : diffusion coefficient [m2s-1]

C : tracer concentration



Louis holtslag ecmwf6h
Louis – Holtslag – ECMWF6h

  • Kz profile

  • Global Radon distribution

  • Comparison with Radon measurement

    • daily cycle

    • correlation


K z mean profile
Kz : mean profile

August 1993

Global mean

Over land

Louis

Holtslag

Ecmwf-6h


K z daily cycle

Louis

Holtslag

Ecmwf-6h

Kz : daily cycle

1h30

4h30

7h30

10h30

13h30

16h30

19h30

21h30





Radon surface

Louis

Holtslag

Ecmwf-6h

Measurement

Radon : Surface


Radon 1200 m

Louis

Ecmwf-6h Measurement

Holtslag No diffusion

Radon : 1200 m


Correlation surface
Correlation : surface

Louis

Holtslag

Ecmwf-6h

Jan Mar May Jul Sep Nov


Correlation 1200 m
Correlation : 1200 m

Louis

Holtslag

Ecmwf-6h

Jan Mar May Jul Sep Nov


Ecmwf3h ecmwf6h
ECMWF3h-ECMWF6h

  • Global Radon distribution

  • Daily cycle

  • Correlation



Radon daily cycle surface
Radon - Daily cycle - surface

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

Measurement


Radon daily cycle 1200 m
Radon - Daily cycle – 1200 m

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion

Measurement


Correlation surface1
Correlation surface

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion

Jun Jul Aug


Correlation 1200 m1
Correlation : 1200 m

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion

Jun Jul Aug


Radon profile
Radon profile

Louis

Holtslag

Ecmwf-6h

Ecmwf-3h

No diffusion