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Earth, Ocean and Atmospheric Sciences
Water mass analysis and comparison with
upwelling year in Trevor Channel
Jie Liu EOSC 573
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Earth, Ocean and Atmospheric Sciences
Motivation Material & Method Water mass features Influence of wind
Outline
Conclusions
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Earth, Ocean and Atmospheric Sciences
Motivation
Help understanding the water spreading and mixing(Tomcazk, 1999).
Enhance local circulation studies(Linder, 2010).
Instructive to the effectiveness of biological and chemistry research.
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Earth, Ocean and Atmospheric Sciences
Material and Method
Station
Name
Latitude(°) Longitude(
°)
Depth(m) Time
TC19 48.7989 -125.2983 87 Feb 18 2015
TC20 48.8157 -125.2818 98 Feb 18 2015
TC21 48.8191 -125.2167 42 Feb 18 2015
TC22 48.8246 -125.1924 69 Feb 18 2015
Rbr1 48.8460 -125.1618 94 Feb 19 2015
Rbr2 48.8402 -125.1517 65 Feb 19 2015
Rbr3 48.8378 -125.1469 34 Feb 19 2015
Rbr4 48.8420 -125.1360 35 Feb 19 2015
Rbr5 48.8495 -125.1482 101 Feb 19 2015
Rbr6 48.8572 -125.1573 25 Feb 19 2015
Mouth11 48.8397 -125.1384 44 Feb 16 2015
Grapp10 48.8369 -125.1341 32 Feb 16 2015
Bam4 48.8312 -125.1379 28 Feb 16 2015
S12 48.8986 -125.0198 33 Feb 17 2015
S14 48.9037 -125.0182 15 Feb 17 2015
S15 48.9075 -125.0126 20 Feb 17 2015
S16 48.9045 -125.0236 55 Feb 17 2015
S17 48.9065 -125.0297 138 Feb 17 2015
S18 48.9085 -125.0328 61 Feb 17 2015
Temperature & Salinity
Conservative Temperature & Absolute
Salinity
Potential Density Contours
T-S diagram
Depth, Pressure, T & S are all
smoothed
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Earth, Ocean and Atmospheric Sciences
Material and Method
(Local wind rose diagram from Bamfiled Marine Sciences Centre)
(Daily upwelling index from Pacific Fisheries Environmental Laboratory) (Environment Canada, Marine Buoy Observations)
Location:
48.835N,
125.998W
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Earth, Ocean and Atmospheric Sciences
Influence of wind With reference of D.M.Farmer ,
Fresh-water thickness =
PE difference=
Correlation with current day wind speed:
R =
= -0.6920
Correlation with last day wind speed:
R = 0.0434
-
,
5
1
25
1
2
5
1
wi
surfacesurfacewindwind
surfacesurfacewindnd
H
dzzS
HS
HH 0f
1
HHH ssgdzzzg
fs
H
m
222
0 2
1
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Earth, Ocean and Atmospheric Sciences
Influence of wind
(Local wind rose diagram from Bamfiled Marine Sciences Centre)
Rbr3
Rbr4
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Earth, Ocean and Atmospheric Sciences
Conclusions
Water mass features
Salinity contours along Trevor Channel verifies it is a fjord
estuary which is correspond with observations by Riley in 2010.
Three types of water masses are identified in most stations from T-
S diagrams with potential density contours and further demonstrate
there exists stratification in the Trevor Channel.
Surface water may come from rivers in Alberni Inlet, intermediate
water is possibly from open ocean, relatively warm bottom water inside
Trevor Channel may due to the summer water residence.
Stratification is further indicated in the common trend of
different layer water mixing.
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Earth, Ocean and Atmospheric Sciences
Conclusions
Influence of wind
Very weak positive correlation coefficience between wind
speed from buoy of last day and current surface layer
thickness.
Little obvious relationship was indicated between
upwelling or downwelling favorable wind and water mass
features near the Bamfield mouth.
Local wind possibly plays a more important role in
changing the water mass characteristics near the inlet mouth.
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Earth, Ocean and Atmospheric Sciences
Reference
[1] Linder R J. Estuarine circulation in Barkley Sound; observed characteristics
and processes[J]. 2010.
[2] Farmer D M, Osborn T R. The influence of wind on the surface layer of a
stratified inlet: Part I. Observations[J]. Journal of Physical Oceanography, 1976,
6(6): 931-940.
[3] Tomczak M. Some historical, theoretical and applied aspects of quantitative
water mass analysis[J]. Journal of Marine Research, 1999, 57(2): 275-303.
[4] McClatchie S, Middleton J F, Ward T M. Water mass analysis and alongshore
variation in upwelling intensity in the eastern Great Australian Bight[J]. Journal
of Geophysical Research: Oceans (1978–2012), 2006, 111(C8).
[5] Hansen D V, Rattray M. New dimensions in estuary classification[J]. Limnology
and Oceanography, 1966, 11(3): 319-326.
[6] Stronach J A, Ng M K, Foreman M G, et al. Tides and currents in Barkley sound
and Alberni Inlet[J]. Marine Geodesy, 1993, 16(1): 1-41.
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Earth, Ocean and Atmospheric Sciences
Acknowledgement
Dr Mark Halverson, Dr Evgeny Pakhomov, Dr Matie Maldonado
Chris , Jan and all my peers in EOSC 573!
