DATE: April 30, 2001
Create as much space as needed within the form.
Geographic Zones Selected (leave blank if done by range):
Geographic Range Selected (leave blank if done by zones):
WORLD
Cell types selected from database (Terrestrial, Coastal, OceanicI, OceanicII, OceanicIII):
Variables and ranges selected from database (if filtered – if not filtered, no entry is needed):
FROST_DAYS_TOTAL NUMBER
<10
SEA TEMPERATURE _MINIMUM_MONTH: >15.5
SEA TEMPERATURE _INTER_ANNUAL_STDEV: <1
Variables added (if any):
What do you expect to get out of clustering these variables or what are you trying to achieve?
(enter name of document if experiment is written up separately
Save the Cluster summary – if will contain much of the
information needed!
(Instructions for summary and data saving are at the end of this document)
Cluster Run Number:_3_
Variables selected in cluster (include any weights if not
set at 1): Frost days, Sea Temperature, Sea temperature,
_Inter_annual_stdev mean annual temperature, precip, ann mean [continuous]
Number of Clusters: 3
Distance Method: [ X ]Average [ ]Maximum
COMMENTS OR DESCRIPTION ON CLUSTER OUTPUT:
We had problems combining these variables and generating an output map; although the variables used in this run are good descriptors to explain mangrove distribution even in combination they do not provide a reasonable result.
Additional Comments on problems or improvements needed:
We strongly recommend to include evapotranspiration (ET)
and potential evapotranspiration (PET) for both Coastal and Ocean I cells in
the metadata source. These variables
integrate other variables (e.g air temperature, relative humidity, solar radiation, wind
speed, etc.) that can help to explain distribution of vegetation (i.e.,wetlands, including mangrove forests) and assess arid conditions along
the coastal zone. A good predictor of
mangrove forest distribution could be the ratio of precipitation and PET but
given the current structure of the data base it is difficult to perform these
calculations efficiently since the variables needed to calculate ET and PET are
not included in the metadata base.
Following are several websites where evapotranspiration data can be downloaded at the same resolution (30’) included in LOICZ VIEW metadata base
Websites/Information
Data:
Evapotranspiration
Potential Evapotranspiration
Water Balance:
http://www-cger.nies.go.jp/grid-e/online1-e.html
http://www-cger.nies.go.jp/grid-e/grid4-e.html
http://www-cger.nies.go.jp/grid-e/gridtxt/tateishi.html
Concepts, formulas, etc.
http://www.smhi.se/sgn0106/if/hydrologi/evapotranspiration.htm
http://loki.stockton.edu/~epsteinc/etcalc.htm
http://www.globe.gov/sda-bin/wt?ghp/archive+L(en)
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