3. Sulfur Cycling in Coastal Upwelling Systems
45
BOXMODEL
CHANGEIN
ALBEDO
ENERGYBALANCE
MODEL(EBM)
EXPONENTIAL
PREDATOR I
PREY
Atmospheric component
CLOUD CONDENSATION
NUCLEI (CCN)
OXIDATION
ATMOSPHERIC OMS
•
Aqueous component
CHANGESTO OMS IN
OCEANS(E.G. DECAY)
EMISSIONOF OMS BY
PHTYOPLANKTON
POPULATION BIOLOGYMODELS
Figure 3.1. Schematic diagram to illustrate the DMS model pre sented.
in the feedback loop are required as well as more detailed measurements
of the amounts of DMS, DMSP, and other components in the atmosphere
and oceans.
The model is based on a one-dimensional model that incorporates
simple stock/flux calculations. If 1 week is the characteristic residence
time of a moderately reactive gas in the atmosphere (Lovelock, Maggs, &
Rasmussen, 1972), then the stock of DMS in the atmosphere can be
calculated. A zero-dimensional energy balance model (Henderson -Sellers
& McGuffie, 1987) considers the earth as a single point , such that:
(1 - a) S/4 = aTe
4
(Eq.3.1)