The GEWEX Integrated Product - Christian Kummerow Paula Brown G-VAP Workshop Madrid, 13-14 June, 2019 - GEWEX water vapor assessment

The GEWEX Integrated Product

         Christian Kummerow
             Paula Brown

           G-VAP Workshop
         Madrid, 13-14 June, 2019

            Image-00-CSU-Logo-TPR.jpg (JPEG Image, 267x217 pixels)   http://veteransgreenjobs.org/wp-content/uploads/2009/02/Image...

A bit of history
 Decided in 2009 that GRP (not yet GDAP) should construct a “Unified product”.

 The Unified product would homogenize all parameters and assumptions that exist
  across distinct products in the Water and Energy sphere (e.g. SeaFlux and SRB would
  use the same sea ice and coastline definitions. They would also use the same SST;
  SRB radiation would use GDAP clouds, temperature, humidity, and aerosol products).

 This turned out to be far more difficult that imagined as initial attempts to unify
  parameters created downstream problems.

 By 2015 GDAP meeting in Xiamen, agreed that the “Unified Product” would be hard
  to achieve with our current understanding of uncertainties, and that we should focus
  on an Integrated Product” that simply put the different products into a single file.

 Agreed on file formats and two products: One Integrated product for diagnostic
  purposes that contained each of the individual product variables, and a second, much
  smaller product, intended for users that trusted the data. Agreed to test one year.

The agreed upon
               “Integrated Product”

 Test period: 1 Jan 2007 – 31 Dec 2007

 1°, 3-hourly equal-area grid

 ISCCP Clouds, nnHIRS (T(p), WV(p)) MAC V2.0 Aerosols, SRB
  Radiation (TOA & Sfc)

 Land/SeaFlux for Sensible and Latent heat flux. LandFlux was more
  than one product.

 GPCP special processing

 ERA-Interim for Water Vapor transport, CAPE, dynamical context

Initial Product Availability

More history

 After initial year, SRB discovered significant biases due mostly to
  temperature profiles coming from nnHIRS (through ISCCP)

 LandFlux activity dissolved except for some assessments of the existing
  products.

 Are still working on issues – which will not go away until each product Is
  perfect.

nnHIRS Products

Temperature (Kelvins) at Surface (“2m”), 900, 800, 740, 680, 620, 560, 500,
440, 380, 320, 260, 200, 150, 100, 50, 10 mb

Percent Relative Humidity at Surface (“2m”), 900, 800, 740, 680, 620, 560,
500, 440, 380, 320, 260, 200, 150, 100, 50, 10 mb -- (0.5 – 110% relative to
Liquid at T ≥ 273 K, 0.5 – 150% relative to Ice at T < 273 K)

** Layers below the surface report -1000, Maximum Surface Pressure = 1019
mb; Minimum Tropopause Pressure = 100 mb

3-hr Product

TA:   1992 02 15 18Z

TIMELINE OF NUMBER OF SATELLITES
            AVAILABLE EACH MONTH

4
3
2
1
1980                                      2010

3-hr Available Observations

       TA:   1992 02 15 18Z

         Percent fill = 5.82%

TA:   1992 02 15 18Z

Product Availability Timeline

Where to find the GEWEX Integrated
              Product
  ftp://rain.atmos.colostate.edu/ftp/pub/pbrown/GEWE
   X_IP_2019/

  NetCDF format
  3-hourly data files

  Who to talk to: pbrown@atmos.colostate.edu

A Water Budget Closure Test

                           E - P = Ñ×Q
30N
20N
10N         Tropical                 Tropical         Tropical       Tropical           Tropical
EQ              Indian             West Pacific    Central Pacific East Pacific         Atlantic
10S              (TI)                (TWP)             (TCP)          (TEP)              (TA)
20S
30S
      0   60E               120E             180                 120W             60W              0

E, P and Div(Q) for Tropical Indian Ocean

E, P and Div(Q) for Tropical Central Pacific

E, P and Div(Q) for Tropical West Pacific

Integrated Product

 Data for 2007
 4 tropical regions: 2 ocean and 2 land
 Moisture balance, Atmos. & Sfc. energy balance

E, P and Div(Q)
           Deep convective cloud fraction from ISCCP

Indian
ocean

 Pacific
 ocean

E, P and Div(Q)
         Deep convective cloud fraction from ISCCP

Congo
 basin

Amazon
 basin

Net surface heat flux
    Precipitation & Deep convective cloud fraction from ISCCP

Congo
 basin

Amazon
 basin

Net surface heat flux
    Precipitation & Deep convective cloud fraction from ISCCP

Indian
ocean

Pacific
ocean

E, P and Div(Q)
Deep convective cloud fraction from ISCCP

Comparing LandFlux Products

                   GLEAM

                  Princeton
                  Penman-Monteith

Summary thoughts
 GDAP now has a significant set of W&E parameters and process studies
  are now possible.
 Writing a new article for GEWEX News. Probably a BAMS to follow up.
 Organizing a workshop in Toledo to highlight early results and to figure
  out next steps.
   •   Venue: Universidad de Castilla - La Mancha, Toledo, Spain
   •   Dates: March 16-18, 2020.
   •   Specific outcome:        A letter to funding agencies advising them of potential new
       fruitful research related to integrated land surface – atmosphere process studies
   •   Organizing Committee:
       - Christian Kummerow, Colorado State University, USA
       - Francisco Tapiador, U. Castilla - La Mancha, Toledo, Spain
       - Isabel Trigo, Instituto Português do Mar e da Atmosfera, Lisbon, Portugal
       - Wouter Dorigo, Vienna University of Technology (TU Wien), Austria
       - Jim Mather, ARM, Department of Energy, USA