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Rockstar · 05-01-22, 05:21 PM

From NASA’s Jet Propulsion Laboratory California Institute of Technology.

https://sealevel.jpl.nasa.gov/data/v...l-oscillation/

What is the Pacific Decadal Oscillation?

The PDO is a long-term (10-20 year) oscillation of the Pacific Ocean in response to the changes in the atmosphere. During a warm (positive) phase, the response of the ocean to low atmospheric pressure over the Aleutian Islands causes ocean currents to bring warm waters in the Eastern Pacific Ocean and along the coast of North America and cool nutrient-rich waters in the western Pacific Ocean. This leads to higher sea levels along the coastlines of the Northeast Pacific. During a cool (negative) phase the Eastern Pacific Ocean becomes cooler and the Western Pacific Ocean becomes warmer. This leads to lower sea levels along the coastlines of the Northeast Pacific.

Why do we care?

The PDO has impacts on fisheries, especially on salmon production in Alaska which is enhanced during a warm phase. Also, the PDO has impacts on weather: a warm (cold) phase tends to cause heavy rains (droughts) in Eastern Pacific Ocean and droughts (floods) in Asia and Australia. In terms of sea-level change, the PDO is associated with sustained increases and decreases in sea level over the course of a decade or more, causing changes in coastal impacts.

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Pacific Decadal Oscillation Influences Drought

Recent sea level height data from the U.S./France Jason altimetric satellite during a 10-day cycle ending June 15, 2004, shows that Pacific equatorial surface ocean heights and temperatures are near neutral, but perhaps tending towards a mild La Niña for this summer and into the fall. “In the U.S. we are still under the influence of the larger than El Niño and La Niña Pacific Decadal Oscillation shift in Pacific Ocean heat content and temperature patterns. Much of the nation’s western farmland and forests are really dry as we continue to struggle with a severe 6-year drought. The reality is that the atmosphere is acting as though La Niña is present. This continuing oceanic pattern in the Pacific and atmospheric pattern over the western U.S. is also a precursor for an active hurricane season for the East and Gulf coasts for our coming summer and fall,” said JPL oceanographer Dr. Bill Patzert.

These images show sea surface height anomalies with the seasonal cycle (the effects of summer, fall, winter, and spring) removed. The differences between what we see and what is normal for different times and regions are called anomalies, or residuals. When oceanographers and climatologists view these “anomalies” they can identify unusual patterns and can tell us how heat is being stored in the ocean to influence future planetary climate events. Each image is a 10-day average of data, ending on the date indicated.

https://earthobservatory.nasa.gov/im...uences-drought

05-01-22, 05:21 PM	#1009
Rockstar Rear Admiral Join Date: Nov 2002 Location: Zendia Bar & Grill Posts: 11,942 Downloads: 10 Uploads: 0	From NASA’s Jet Propulsion Laboratory California Institute of Technology. https://sealevel.jpl.nasa.gov/data/v...l-oscillation/ What is the Pacific Decadal Oscillation? The PDO is a long-term (10-20 year) oscillation of the Pacific Ocean in response to the changes in the atmosphere. During a warm (positive) phase, the response of the ocean to low atmospheric pressure over the Aleutian Islands causes ocean currents to bring warm waters in the Eastern Pacific Ocean and along the coast of North America and cool nutrient-rich waters in the western Pacific Ocean. This leads to higher sea levels along the coastlines of the Northeast Pacific. During a cool (negative) phase the Eastern Pacific Ocean becomes cooler and the Western Pacific Ocean becomes warmer. This leads to lower sea levels along the coastlines of the Northeast Pacific. Why do we care? The PDO has impacts on fisheries, especially on salmon production in Alaska which is enhanced during a warm phase. Also, the PDO has impacts on weather: a warm (cold) phase tends to cause heavy rains (droughts) in Eastern Pacific Ocean and droughts (floods) in Asia and Australia. In terms of sea-level change, the PDO is associated with sustained increases and decreases in sea level over the course of a decade or more, causing changes in coastal impacts. ———————— Pacific Decadal Oscillation Influences Drought Recent sea level height data from the U.S./France Jason altimetric satellite during a 10-day cycle ending June 15, 2004, shows that Pacific equatorial surface ocean heights and temperatures are near neutral, but perhaps tending towards a mild La Niña for this summer and into the fall. “In the U.S. we are still under the influence of the larger than El Niño and La Niña Pacific Decadal Oscillation shift in Pacific Ocean heat content and temperature patterns. Much of the nation’s western farmland and forests are really dry as we continue to struggle with a severe 6-year drought. The reality is that the atmosphere is acting as though La Niña is present. This continuing oceanic pattern in the Pacific and atmospheric pattern over the western U.S. is also a precursor for an active hurricane season for the East and Gulf coasts for our coming summer and fall,” said JPL oceanographer Dr. Bill Patzert. These images show sea surface height anomalies with the seasonal cycle (the effects of summer, fall, winter, and spring) removed. The differences between what we see and what is normal for different times and regions are called anomalies, or residuals. When oceanographers and climatologists view these “anomalies” they can identify unusual patterns and can tell us how heat is being stored in the ocean to influence future planetary climate events. Each image is a 10-day average of data, ending on the date indicated. https://earthobservatory.nasa.gov/im...uences-drought __________________ Guardian of the honey and nuts Let's assume I'm right, it'll save time.