Questions tagged [ocean-currents]

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8
votes
1answer
969 views

How to Calculate the Equilibrum Function for use in Tide Calculations using Harmonic Constituents

I have found a wealth of information using Harmonic Constituents to calculate tide levels. H(t) = Amplitude * cos ( t * harmonicSpeed + phase lag). Yet when I try to apply this to constituents from ...
11
votes
1answer
260 views

Is there conclusive evidence for the Antarctic Circumpolar Current developing after the glaciation of Antarctica?

The Antarctic Circumpolar Current (ACC) is the continuous oceanic current that encircles the Antarctic continent, as is often explained in the literature as being the cause of the onset of glaciation ...
13
votes
2answers
906 views

Forecasting oceanic rogue waves

A rogue wave is, according to NOAA, "a large, unexpected and dangerous" oceanic wave. These are also known as 'killer' or 'freak' waves and have been a part of folklore of the past and observation of ...
11
votes
1answer
1k views

Why is ocean surface velocity around 3% of wind velocity?

Many introductory level textbooks suggest that, as a rule of thumb, the velocity of the ocean surface is around 3% the wind velocity at 10 meters above the sea surface. For instance, Ocean ...
12
votes
2answers
323 views

How stable is the Gulf Stream? Could it stop suddenly?

I'm not completely clear on what Western intensification means, but it looks like a pretty powerful (combination of) forces that presumably wouldn't be likely to change on a timescale of years (or ...
10
votes
1answer
7k views

What visual wave behaviour help to tell if a tide is going in or out?

I have always wondered how someone could tell, by a brief observation (a few minutes at most), whether a tide is receding or advancing on a rainy day. Assuming there is no access to tide times and ...
11
votes
1answer
162 views

What efforts have been made to separate the microseismic events related to wind-related ocean waves from the components of volcanic origin?

I have read the question What generates the microseism? and it's accompanying answer. In [#1, cited below], they use the azimuth values of seismographic activity on the flanks of the volcano ...
14
votes
1answer
251 views

Odd structures in 66 year NCEP daily temperature reanalysis

I have done some simple analyses of historical surface temperature from the NOAA NCAR/NCEP reanalysis (downloaded from ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.dailyavgs/surface/air.sig995.*.nc)...
15
votes
4answers
5k views

Is there a way to find the direction to land in the middle of an ocean?

Can I find the direction to land when I am in the middle of the ocean and can not see any land? This is a theoretical question. Any method that doesn't use over-technical methods such as smartphones ...
9
votes
0answers
99 views

How much does the Meridional Overturning Circulation strengthen the Gulf Stream?

While the Gulf Stream is a western boundary current (WBC), one professor told me that the Gulf Stream is stronger than it should be just by using theoretical calculations of WBC. How much is the heat+...
11
votes
1answer
259 views

Use of Neodymium in Paleoceanography

$\varepsilon_{Nd}$ (i. e. the relative deviation of $\frac{^{143}Nd}{^{144}Nd}$ from a standard) is often used as a proxy in paleoceanography to identify the basin of origin of oceanic currents. But ...
6
votes
1answer
102 views

Why does the meridional overturning circulation take the convoluted path that it takes?

Why does it take the very weird loop that it takes in the Pacific Ocean? And also in the Indian ocean too?
9
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1answer
100 views

How much is Iceland/Norway/Western Europe warmed up by the Meriodional Overturning Circulation?

A shutdown in the circulation was associated with the Younger Dryas stadial, also referred to as the Big Freeze, so I'm curious how much warmer Western Europe is due to the MOC, and how much heat (in ...
14
votes
1answer
784 views

What is the force imposed by underwater currents?

I would like to calculate the force of an underwater current on a meter by meter plate (or any other unit that you may use to represent it) that is standing in front of the current. How do I calculate ...
25
votes
1answer
39k views

What is responsible for the underwater waterfall illusion of Mauritius Island?

From an aerial view just off the island of Mauritius, there is what appears be an underwater waterfall. The picture below illustrates this visual phenomenon: The image can also be seen from the ...
16
votes
2answers
774 views

How does remote sensing of ocean currents work?

I am aware that techniques exist for measuring surface currents using HF radar, either from land-based installations or from space. How do these work? I have assumed in the past that it's some sort ...
8
votes
2answers
216 views

How does heat get transported between the surface layer, twilight zone, and the deep ocean?

Just as importantly, how do we measure the heat that's transported from the surface layer into the twilight zone and deep oceans?