Impacts of Stratospheric Sulfate Geoengineering on Food Supply in ...

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Impacts of Stratospheric Sulfate Geoengineering on Food Supply in ...

ong>Impactsong> ong>ofong> ong>Stratosphericong> ong>Sulfateong>

ong>Geoengineeringong> on Food Supply in China

Lili Xia and Alan Robock

Department ong>ofong> Environmental Sciences

Rutgers University, New Brunswick, New Jersey


How does stratospheric sulfate geoengineering

affect food supply in China

= significant at the 95% level (Robock et al., 2008)


Factors that affect crop yields

Natural

Temperature

Precipitation

Solar radiation

CO 2

O 3

Soil

Agricultural techniques

Timing ong>ofong> planting and harvest

Fertilizer

Cultivar (type ong>ofong> seed)

Pesticides

Irrigation

Tilling


Yields ong>ofong> major crops and annual weather anomalies in mainland China


How does stratospheric sulfate geoengineering

affect food supply in China

Climate Model

(ModelE)

Crop Model

(DSSAT)

Weather Man S Build X Build

Daily Max. T

Daily Min. T

Daily Precipitation

Daily Solar Radiation

Soil Layer Depth

Sand, Silt and Clay

Nutrients

pH

Cultivar

Planting Date

Fertilizer

Irrigation


Crop Production in China 2008 (Mt)

Maize (Mt)

Rice (Mt)

Shandong

Wheat (Mt)

Jiangsu


How well does DSSAT do

Rice in Jiangsu

Rice in Shandong

Observation

Reported fertilizer &

Auto Irrigation

No water &

Nitrogen Stress


Difference responses after geoengineering

1978

2008


Three differences

between two locations:

Soil prong>ofong>ile

Start

Climate before

geoengineering

ong>Geoengineeringong>

impacts on climate

Shandong

Lili Xia and Alan Robock

Department ong>ofong> Environmental Sciences

Jiangsu


ong>Geoengineeringong> impacts on climate at two locations:


Jiangsu:

Soil prong>ofong>ile

Climate

Climate

(Shandong)

ong>Impactsong>

(ong>Geoengineeringong>)

Jiangsu

Shandong


Jiangsu:

Soil prong>ofong>ile

Climate

Climate

(Shandong)

ong>Impactsong>

(ong>Geoengineeringong>)

ong>Impactsong>

(Shandong)

Jiangsu

Shandong


Preliminary results:

Different regions response differently;

Regional climate and climate perturbations

from geoengineering both matter;

To adapt to geoengineering, shifting crop

grows region.

More study is needed.

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