3d exploration of weather data in combination with iasi l2...

Royal Netherlands Meteorological Institute Ministry of Infrastructure and the Environment

3D Exploration of Weather Data in Combination with

IASI L2 Products for Better Understanding of

Potential Applications

Michal Koutek, S. de Haan,

I. van der Neut, F. Debie,

P. de Valk (KNMI), S. Tjemkes (EUMETSAT)

Email: koutek@knmi.nl Date: 25-09-2014

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Preliminary Visualization study for the MTG – IRS project

MTG-IRS objectives: • To support regional NWP in Europe,

through detailed 3D fields of temperature, humidity, and wind at high vertical, horizontal and temporal resolution

• To support now-casting and very-short range forecasting

Obviously, a lot of effort is put into development of L2 algorithms and products.

• • •

•

•L0

•L0

•L1

•L1 processing

•Spectral sounding

•Interferogram •Earth

•Dwell

•Detection element

•time

• number

•wave

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

IASI: Polar-Orbiting Hyper-Spectral Sounder

IASI as proxy for IRS

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Input data for our visualization study: MTG-IRS L2 Proxy (IASI) Data EUMETSAT provided us with: • Point-profiles at ECMWF levels with prior fields (ECMWF)

and retrieved fields (IASI L2): • Temperature, specific humidity, and relative humidity

• Quality control indicators We have computed derived fields such as Theta-W. Besides pressure information we need geometric height for 3D grid.

Note on retrieval algorithm: EUMETSAT implemented the UWPHYSRET algorithm as the IRS Level 2 Development and Validation Processor (IRS-L2DVP).

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Statistics: Important step in understanding • Statistical methods such bias and standard

deviation provide a global overview of the numerical quality of the retrievals.

• What can be the next step beyond statistics and numerical analysis?

bias std. deviation bias std. deviation

[KNMI: Siebren de Haan, Gert-Jan Marseille, Paul de Valk]

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Next Step: Visualization and Exploration

Our approach: • Apply a well-established concept of interactive 3D visualization

of meteorological data that uses Virtual Reality.

=> Weather 3D Explorer application [KNMI]

• Provide meteorological context to the IASI retrieval data with actual satellite and RADAR images, and NWP models such as ECMWF and HARMONIE.

• Let the forecasters and the scientists interactively explore the weather situation and study the 3D profile data.

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Selection of weather cases

2013.06.20 09:00 utc 2013.06.20 10:00 utc 2013.06.20 11:00 utc

Which MetOpA/B swath to take for a detailed exploration ?

2012.06.20 2012.07.10 2013.06.20 2013.06.21

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Selection of weather cases

2012.06.21 09:00 utc 2012.06.21 11:00 utc

Valid retrieval points and cloude-free areas..

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Putting the pieces together ..

2012.06.21 20:00 utc 2012.06.21 20:00 utc

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Iso-contours of CLOUDS (HARMONIE model)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Iso-contours of RAIN intensity (HARMONIE model)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Cross-section Theta-W (IASI L2)

Cross-section Theta-W (HARM)

Cross-section Theta-W (IASI L2)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Method: Bring the 3D point-profile data into 3D grid.

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Method: Bring the 3D point-profile data into 3D grid.

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Method: Bring the 3D point-profile data into 3D grid.

Specific humidity L2VDP (IASI)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Visualize the gridded profile data in 3D

NOTE: SPARSE DATASET

Specific humidity L2VDP (IASI)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Visualize the gridded profile data in 3D

NOTE: IT IS A SPARSE DATASET

• 3D cross-sections, color-mapping • 3D iso-surfaces

Specific humidity L2VDP (IASI)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

For context provide satellite images, ECMWF model clouds

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved fields: Temperature Temperature IASI

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved fields: Temperature Temperature ECMWF

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved fields: Temperature Temperature DIFF = IASI - ECMWF

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved temperature and model temperature

IASI

ECMWF

IASI

ECMWF

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved fields: Relative humidity Rel. humidity IASI

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved fields: Relative humidity Rel. humidity ECMWF

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved fields: Relative humidity Rel. humidity DIFF = IASI - ECMWF

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring retrieved fields: Specific humidity Spec. humidity IASI

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Spec. humidity ECMWF

Exploring retrieved fields: Specific humidity

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Spec. humidity DIFF = IASI - ECMWF

Exploring retrieved fields: Specific humidity

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Specific humidity

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Temperature

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Theta-w 2013.06.20 09:00utc

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Theta-w 2013.06.20 10:00utc

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Theta-w 2013.06.20 11:00utc

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Theta-w 2013.06.20 12:00utc

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Theta-w 2013.06.20 13:00utc Theta-w (IASI)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Theta-w 2013.06.20 13:00utc Theta-w (ECMWF)

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Interesting observations: Theta-w 2013.06.20 13:00utc Theta-w (DIFF) IASI - ECMWF

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring differences: Temperature

Background: ECMWF cross-section Foreground: IASI data points

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring differences: Relative humidity

Background: ECMWF cross-section Foreground: IASI data points

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Exploring differences: Specific humidity

Background: ECMWF cross-section Foreground: IASI data points

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Time for short videos

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

Conclusions

• Interactive 3D exploration may be very helpful for understanding of actual weather situation and interpretation of retrieved atmospheric profiles.

• We cannot make the data better than they actually are, but we can make the relevant data clearly visible in the right context.

• The difference between prior and posterior fields has to be studied and better understood.

3D Exploration of Weather Data in Combination with IASI L2 Products M. Koutek, KNMI, 25-09-2014

More information:

http://www.knmi.nl/samenw/w3dx/images/3D-demos/presentation-3D-VIS-IASI-in-W3DX-at-eumetsat/#w3dxIasiDemos Or just google: “w3dx iasi knmi” ;-) Thank you for your attention.