University of Connecticut Climate Resource Exchange

Showing posts with label oceans. Show all posts
Showing posts with label oceans. Show all posts

Tuesday, August 16, 2011

Warming Ocean Leading to Less California Coast Fog

A recent article in the Santa Cruz Sentinel discusses the declining fog on the California coast. Throughout the second half of the 20th Century, scientist have found that the fog, which is so critical for the region's vegetation, has been affected by warming ocean temperatures. Researchers are quoted in the article as saying:

  • "Redwood forests and other plants are so dependent on fog and fog is declining; this spells an uncertain future for redwood trees and redwood forest ecosystems."
  • "The Central coast has such rich diversity of local endemic plants -- more so than anywhere in California. A decrease in fog could shift the vegetation in general and we could lose these species."
  • "Fog formation is very much dependent on warm air interacting with the cold ocean. If you warm up the ocean surface, the contrast between the atmosphere and sea surface temperature goes down."

To see the beautiful landscape which the fog enables, check out this cool time lapse of the fog around the Santa Ynez Mountains near Santa Barbara, CA!




Thursday, August 4, 2011

The Conveyor Belt

In honor of Discovery Channel's Shark Week, the CRE Blog is featuring ocean-related content  this week.


This image, from NASA, shows temperature values in the Gulf Stream.

The Gulf Stream is a warm ocean current that influences the climate on both sides of the Atlantic Ocean. By transporting warm water from Florida, up the United States' eastern seaboard, and across the Atlantic to Europe, this current creates warmer climates than otherwise would be possible from Bermuda to Northern Europe. Click here for maps of current sea surface temperatures in the Gulf Stream.

The Great Ocean Conveyor Belt

The Gulf Stream is one part a Global Conveyor Belt, known as Thermohaline Circulation, in the oceans that moves warm and cold water throughout the Earth's oceans. It is driven by density. Cold, dense water in the polar regions sinks, flows toward the equator, and rises back toward the surface. Warm water originating in the equatorial regions, on the other hand, is less dense and flows across the surface of the oceans toward the polar regions. These currents have a vital impact on the entire global climate. Click the animation above to see it in action!

Wednesday, August 3, 2011

The Rising Sea

In honor of Discovery Channel's Shark Week, the CRE Blog is featuring ocean-related content  this week.


Loss of land-based ice, like on Antarctica, is one of the driving factors behind sea level rise

Climate is the driver of sea level change. The Earth has alternated between Glacial and Interglacial Periods for millions of years. During a Glacial Period, or Ice Age, much of the water on Earth is trapped in ice sheets and, consequently, sea level drops. Interglacial Periods, on the other hand, are times of warmer temperatures which cause ice sheets to melt. When the ice becomes liquid water, it eventually finds its way to the oceans and raises the sea level. In addition, because the oceans are warmer during interglacial periods, the water expands (known as thermal expansion), which also adds to the sea level rising.

This animation from NOAA shows evidence of loss of ice in the North Pole.

Sea level has steadily risen 1-2.5 millimeters a year since 1900, and it is expected to continue to rise throughout the 21st century. Although there is no perfect model to absolutely predict the future, it is possible to investigate "What If?"

Models based on elevation data can predict what areas could be vulnerable due to rising sea levels.

The Department of Geosciences Environmental Studies Laboratory at the University of Arizona has a web tool that does just that. They have developed a Geographic Information System (GIS) that uses Digital Elevation Models (DEM) to show what areas are potentially vulnerable to sea level change. This web visualization, developed with ESRI's ArcViewer for Flex, allows users to set the amount of sea level rise in one meter increments with a range from no change to six meters.

Tuesday, August 2, 2011

Climate Change and Coral Reefs

In honor of Discovery Channel's Shark Week, the CRE Blog is featuring ocean-related content  this week.

Coral Reefs are some of the most colorfully vibrant and biodiverse habitats on Earth, but they are also extremely vulnerable to adverse effects of fluctuations in sea conditions. When sea temperature rises, corals become stressed and coral bleaching often begins. Coral bleaching, which results in the coral turning white, is a breakdown in the symbiotic relationship between the organisms that comprise coral. Although this does not necessarily mean the coral has died, it is left extremely vulnerable to further damage and death. 

An introduction to coral reefs by NOAA

Although Coral Reefs around the world seem to be stressed more frequently due to rising global temperatures, there is some scientific evidence that corals are able to survive, recover from and adapt to these stressful conditions. Dr. Stephen Palumbi of Stanford University presents evidence of this from America Samoa in the video below. Dr. Palumbi discusses the stress caused by changing temperatures in addition to the stress caused by Ocean Acidification, which occurs due to larger concentrations of Carbon Dioxide in the Earth's Oceans

In this video, Dr. Stephen Palumbi presents his research regarding the coral reefs of America Samoa

The video above, from UCLA's Life Sciences Lecture Series is a bit lengthy. If you are interested in the topic, but don't necessarily want to invest 40 minutes of your attention span, check out these videos by Dr. Palumbi and his colleagues, which are 2-4 minutes in length and focus on ecological sustainability.

Monday, August 1, 2011

Shark Week Ocean Reading

In honor of Discovery Channel's Shark Week,  the CRE Blog is featuring ocean-related content this week.


Author Susan Casey is Editor-In-Chief of O, The Oprah Magazine

The Wave by Susan Casey - The Wave examines the largest and most extreme waves of our oceans. Throughout the book, Casey documents two groups who chase these waves around the world; the scientists who wish to learn the secrets of our planet and those surfers who wish to push themselves to the limit physically and spiritually by riding freakishly large waves. This book features discussion of climate in terms of whether or not a consequence of global warming will be more stormy oceans, and thus, larger waves. Click here to read a review from the New York Times.


Casey is also the author of The Devil's Teeth, which focuses on Northern California's Great White Sharks. Click here for the New York Times review


Author Dr. Bruce Parker, currently of the Center for Maritime Systems at the Stevens Institute of Technology, is the former Chief Scientist of the National Ocean Service.


While Casey's writing features a journalistic tone, The Power of the Sea by Bruce Parker- former Chief Scientist of the National Ocean Service in NOAA- features a voice that is more scientific in nature. Parker discusses particular extreme events like the 2004 tsunami in the Indian Ocean and successfully conveys the history of the human mission to predict ocean related phenomena (for example, tides, tsunamis and storm surges). In addition, he details our contemporary technology that is in use and working toward this end of improving our ability to predict the Sea. The last chapter, entitled Predicting the Future-and Saving Lives is a forward looking discussion driven by the topics of El Niño and long term climate change.