MSC 264 Lecture Notes - Lecture 3: Polar Ice Cap, Secular Equilibrium, Lysocline

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30 Oct 2017
Department
Course
Professor
1
Name: Audrey Abrinko
MSC215 Chemical Oceanography
Comprehensive Homework 2 (total possible pts 100)
Due by 12:30 PM on Friday, November 18, 2016
1. (2 points) Which of the following radioactive isotopes can provide an absolute dating for
marine sediment cores of 1000-30,000 year age?
A) 210Pb
B) 14C
C) excess 230Th
D) 10Be
2. (2 points) Which process does not influence seawater alkalinity in the modern ocean?
A) Primary production
B) River Ca input to the ocean
C) CaCO3 dissolution on the sea floor
D) Transfer of CO2 from the ocean to the atmosphere
3. (2 points) Which process increases ocean uptake of atmospheric CO2 over geological
times?
A) Increasing river input of Ca to the ocean
B) Increasing reverse weathering in the ocean
C) Increasing coral reef production
D) Increasing the volume of polar ice cap
4. (2 points) Which statement is incorrect?
A) Increasing river Ca input to the ocean lowers oceanic lysocline
B) CaCO3 dissolution on sea floor compensates for CO2 transfer from the ocean DIC
pool to terrestrial C reservoir
C) Submarine hydrothermal activities influence ocean uptake of atmospheric CO2 over
geological times
D) Ocean uptake of atmospheric CO2 during glacial period is accompanied by a pulse of
seafloor CaCO3 dissolution
5. (2 points) Which isotope cannot be used to date sediment cores?
A) 14C of foraminifera CaCO3 shells
B) 18O of foraminifera CaCO3 shells
C) sedimentary 230Th in secular equilibrium with 234U
D) 10Be in sediments
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2
6. (2 points) Which parameter cannot be used to estimate ocean uptake of anthropogenic
CO2?
A) PCO2
B) δ 13C
C) δ 14C
D) δ 18O
7. (2 points) In the present-day ocean, δ13C of seawater DIC correlates with:
A) Seawater Cd
B) Seawater silicate
C) Seawater salinity
D) Seawater temperature
8. (2 points) Which statement is incorrect regarding ocean uptake of anthropogenic CO2?
A) Anthropogenic CO2 has been detected in the deep water of the North Atlantic Ocean
B) Terrestrial biomass is currently a sink of anthropogenic CO2 to the atmosphere
C) Over 50% of total anthropogenic CO2 released is observed in the ocean
D) Both δ13C and 14C of seawater DIC can be used to understand ocean uptake of
anthropogenic CO2
9. (2 points) The isotope system that cannot be used to understand glacial/interglacial
variation of deep ocean circulation include:
A) δ13C of foraminifera CaCO3
B) δ18O of foraminifera CaCO3
C) 14C of foraminifera CaCO3
D) Cd/Ca ratio of foraminifera CaCO3
10. (2 points) Data of δ18O and δ13C recorded in foraminifera CaCO3 shells show that, as
compared to the present-day ocean, the glacial ocean has:
A) Lower δ18O and higher δ13C
B) Higher δ18O and lower δ13C
C) Lower δ18O and δ13C
D) Higher δ18O and δ13C
11. (2 points) Equilibrium isotope fractionation results from:
A) The fact that heavier isotopes of an element typically form slightly weaker bonds to
other atoms.
B) The fact that heavier isotopes of an element typically form slightly stronger bonds to
other atoms.
C) The fact that molecules containing heavy isotopes move somewhat faster at a given
temperature.
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