Remote sensing of environment and disaster laboratory

Institute of Industrial Science, The University of Tokyo, JapanASSESSMENT OF METEOROLOGICAL SUITABILITY
MAPPING FOR CHINESE CABBAGE IN AUTUMN SEASONOF EAST ASIA FROM 2001 TO 2020

photoShuai Shao and Wataru Takeuchi
Institute of Industrial Science, The University of Tokyo, Japan
Abstract: Chinese Cabbage has been an important daily vegetable supply for human or livestock’s meals. As one of the bio-geophysical assessment ofsuitability, meteorological suitability focuses on temperature and precipitation. This study presents the meteorological suitability mapping of ChineseCabbage across all over East Asia and a specific Kawakami village through a Google Earth Engine geo-visualization of remote sensing imageries
products. MODIS Land Surface Temperature and Emissivity (MOD11) and Global Satellite Mapping of Precipitation (GSMaP) were all utilized fortwo decades’ meteorological suitability mapping analysis in autumn season (September, October, November) from 2001 to 2020. The suitability
classification range is parsed into five levels, individually as optimal, suitable, marginal, unsuitable, and pessimal. Meteorological suitability of whole
East Asia presents no clear discipline within 2 decades because of potential climate changes and unpredictable meteorological events across large
areas, while meteorological suitability of Kawakami village was mainly optimal and suitable while it became unsuitable and pessimal since 2016
because of the precipitation increase.

1.BACKGROUND

3.RESULTS & DISCUSSIONS

Bio-geophysical suitability

East Asia

Meteorologicalsuitability: Temperature& Rainfall
Geomorphologicalsuitability: Slope,Elevation and NDVI

Soil environment suitability: OrganicCarbon, Bulk densty, pH, Soil
moisture, Soil nitrogen,
Sand/Silt/Clay, Biome/Taxonomy

2.MATERIALS & METHODOLOGY

Fig 3. Precipitation and temperature time-series characteristics of East Asia
1.

Fig1. Map of study area

2.

3.

4.

Fig 4. Meteorology suitability map of East Asia

Average precipitation has been keepincreasing except abnormal sheer drop in
2005, 2008 and 2014; the temperature has
been relatively stable, stays around 10℃ upand down.
Except for parts of northern China andSouthern Russia areas in 2002 and 2016, thetemperature suitability of East Asia Nearly all
optimal and suitable.
There’s no obvious trend of changesprobably in 2 decades probably because ofclimate changes and meteorological events
happening including occasional heavy rain ortyphoon.
Because of the unpredictable changes ofprecipitation, the changing trend ofmeteorology also cannot be explained withdiscipline.

Kawakami Village
Table 2. Criterion of precipitation andtemperature categorization
Criterion
OptimalSuitable
Marginal
UnsuitablePessimal

Precipitat
ion (℃)
10-20
5-10 and
20-25
0-5 and25-30-5-0 and30-35< -5 and> 35

Temperature(mm)
200-375
181.25-200 and
375-418.75
162.5-181.25 and418.75-437.50
143.75-162.5 and437.5-456.25< 143.75 and >456.25

Fig 5. Precipitation and temperature time-series characteristics of Kawakami village1.

Fig 2. Flowchart of this study
Table 1. Details about data products
Data

Precipitation2.

Temperature

SourceJAXA

NASA MODIS

Product

Near RealTime

MOD11A2 v006

Temporal 2000-01-01
Range
to present

2000-02-18 topresent

Temporal
Resolution

1 hour

8-day

SpatialResolution0.1-degree

1-km

Fig 6. Meteorology suitability map of Kawakami village

From 2001 to 2015, the average
precipitation of autumn season isbasically below 500mm which issuitable for Chinese Cabbage to growexcept particular year as 2004, 2005,2009 and 2015. Since 2016, theprecipitation rises above 600mm,
making the precipitation suitability
deteriorate.
Theintegrated
meteorologicalsuitability also presents similar trend
as precipitation suitability, over rain
since 2016 may lead to Chinese
Cabbage roots corrupted or attract
pests in natural farmlands, moistureproof facilities may used in
Kawakami in autumn season.

3. For Kawakami village, the temperature
suitability shows climate in this place in the past 20years was all suitable for Autumn Chinese Cabbage
A meteorological suitability methodology was constructed to assess forto grow, however, as precipitation started toAutumn Chinese Cabbage from 2001 to 2020 by integrating land surface
increase since 2016, the precipitation suitability oftemperature (MOD11A2) and precipitation (GSmaP_nrt) datasets.
Kawakami village turned out to be “unsuitable”
For general East Asia, the temperature suitability almost stays the same
whereas previous years’ precipitation suitability
in 20 years while the precipitation varies with no discipline, therefore thewas mainly optimal and suitable.
integrated meteorological suitability shows no clear trend.

4.CONCLUSIONS
1.
2.

For further details, contact: Name, Ce-506, 6-1, Komaba 4-chome, Meguro, Tokyo 153-8505 JAPAN (URL: http://wtlab.iis.u-tokyo.ac.jp/ E-mail: sshuai@g.ecc.u-tokyo.ac.jp)