Geoscience Reference
In-Depth Information
Chlorophyll (mg m -3 )
Chlorophyll (mg m -3 )
Figure 7.7 Examples of vertical
profiles of temperature (solid
line), chlorophyll (dashed line),
and nitrate (dots in (a)-(c),
bold line in (d). (a) The western
English Channel (Sharples
et al., 2001b ) . (b) The northeast
shelf of New Zealand (Sharples
et al., 2001 a) . (c) Northeast
flank of Georges Bank. (Data
courtesy of David Townsend,
University of Maine, and the
US GLOBEC Program.)
(d) Monterey Bay, California.
Adapted from Steinbuck et al.,
2009 , data courtesy of Jonah
Steinbuck, Stanford
University, and
co-workers with permission
from ASLO.
(a)
(b)
0
12
3
4
5
0
1
2
Temperature(
C)
Temperature(
C)
13
16
19
9 2 5 8 1
0
0
-40
-40
-80
-80
-120
-120
-160
0
2
4
6
024
6
8
Nitrate (mmol m -3 )
Nitrate (mmol m -3 )
Chlorophyll (mg m -3 )
Chlorophyll (mg m -3 )
(c)
(d)
0
1
2
0 0 0 0
Temperature(
C)
Temperature(
C)
57 9 1 3
13
14
15
16
0
0
-40
-10
-80
-20
0
2
4
6
8
10
0
2
4
6
8
Nitrate (mmol m -3 )
Nitrate (mmol m -3 )
the base of the layer (Sharples and Tett, 1994 ) and there must be sufficient light
to drive photosynthesis. Moreover, as mixing drives nutrients into the layer, it will
also be removing phytoplankton from the layer; growth within the layer needs to be
able to offset this export to deeper water. A numerical model of phytoplankton growth
within a framework similar to the TC model described earlier in Section 7.2.1 does
show the development of a post-spring bloom SCM made up of neutrally buoyant
phytoplankton. However, the SCM only develops if there is some 'background'
mixing at the thermocline (Sharples and Tett, 1994 ) , potentially attributable to one
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