Workshop Objectives

1
GPM
Global Precipitation Measurement Mission An
International Partnership Precipitation
Satellite Constellation for Research on Global
Water Energy Cycle
Workshop Objectives Eric A. Smith -- NASA/GSFC

• 2nd International GPM Ground Validation Workshop
• Eric A. Smith NASA/Goddard Space Flight Center,
  Greenbelt, MD 20771
• eric.a.smith_at_nasa.gov tel [phone]
  fax [phone]
• 27-30 September 2005 Taipei, Taiwan

2
Purpose High Level Science Goals of
International GPM Ground Validation (GV) Research
Program?

• Purpose Ensure highest possible quality in GPMs
  satellite precipitation measurement time series
  by (a) obtaining quantitative measures of
  retrieval uncertainty throughout length of
  record, (b) providing continuous support to
  improvement of GPMs standard precipitation
  retrieval algorithms, and (c) using GCM-RA, NWP,
  and HYDROMET modeling as part of GV toolkit
  though GV-measurement guided data assimilation.
• High Level Scientific Objectives
• Support improvement of satellite precipitation
  retrieval algorithms -- by providing GV
  measurements directly related to physical
  formulations and physics assumptions embedded in
  algorithm designs.
• Establish quantitative uncertainties in GPM
  satellite precipitation retrievals using
  well-defined error metrics including -- (i)
  conditional bias errors (systematic departure
  from true average value), (ii) conditional
  precision errors (random fluctuation from true
  zero-bias average value), (iii) conditional
  spatial-temporal covariance errors (departure
  from true space-time lag-/auto-correlation
  structure), (iv) any other scientifically
  useful metrics providing insight on GPM retrieval
  quality.
• Seek improved understanding of underlying
  dynamical, thermodynamical, hydrological,
  macrophysical, and microphysical properties of
  precipitating storms throughout their life cycles
  -- by implementation of diverse GV measurement
  program, including development of new GV
  methodologies new GV instruments.

3
(No Transcript)
4
Main Objectives of 2nd International GPM GV
Workshop?
1. Establish Foremost Algorithm Developers
Requirements From GPM GV Measurement
Program Algorithm developers require variety of
precipitation measurements from ground
instruments and aircraft for direct comparison to
their algorithm precipitation estimates -- plus
additional remotely sensed and in situ
measurements that support improvement of physical
formulations and physics assumptions used in
their algorithms -- measurements from, e.g.,
cloud microphysics laser-imaging systems,
up-/down-viewing ground radiometers, specialized
ground radars including Doppler profilers, impact
and optical disdrometers, state-of-art precision
rain gauges and dense gauge networks,
state-parameter/moisture/wind profiling systems,
etc.). 2. Ensure System Integration of Data
Acquisition from GPM GV Site Network by use of
System Engineering Principles Three types of GPM
GV sites are envisaged (1) Standard Sites, (2)
Supersites, and (3) Regional (Virtual)
Supersites. They will be funded and managed by
owner institutions for specific purposes -- small
number of which will be dedicated to GPM. To
ensure successful GV research program, we must
develop data acquisition plan from individual
sites in framework of System of Sites to ensure
GPMs GV requirements are met. It is recommended
that data acquisition process from System of
Sites be developed according to principles of
System Engineering. 3. Develop Plan for
Systematic Accumulation of Experience Data from
Existing Sites to Ensure Sensible GPM GV Site
Network Implementation Plan GPMs GV site
network planning should be based on strengths and
experience of participating individuals and
institutions -- and thus requires systematic
gathering of experience data -- data that are
essential to sensible implementation
deployment of GV site network.
5

• How Workshop Will Accomplish These Objectives
• 1. 1st segment of Workshop will consist of GPM
  Mission Status, Algorithms-Applications
  Requirements, and System Integration of Data
  Acquisition from GV Site Network.
• 2nd Segment of Workshop will consist of Working
  Group Meetings Reports -- where meetings should
  focus on 3 main themes of workshop (i.e.,
  algorithm developer requirements, integration of
  site data acquisition plan for site network,
  accumulation of experience data) -- without
  restricting discussion to these themes.
• 3. 3rd Segment of Workshop will consist of
  Individual Reports Bearing On Site Experience.
  Obtaining copies of these presentations is very
  important in synthesizing experience data.