Second warmest March on record; will La Niña be gone by hurricane season?
March 2008 was the 2nd warmest March for the the globe on record, according to statistics released by the National Climatic Data Center. Over the Northern Hemisphere, and over all of the globe's land areas, March 2008 was the warmest March in the 128-year global record. Only the presence of a moderately strong La Niña event that cooled ocean waters in the central and eastern equatorial Pacific prevented March 2008 from surpassing March 2002 as the warmest March on record. March broke a string of three straight months when the globe did not record a top ten warmest month ever. Between February 2006 and November 2007, the globe set top ten monthly warm temperature records for 22 straight months.
Figure 1. Departure of temperature from average (the anomaly) for March of 2008, the second warmest March on record for the globe. While the U.S. recorded slightly below average temperatures, much of Asia and Europe saw remarkably warm temperatures. Image credit: National Climatic Data Center.
How much cooling did La Niña give to the globe in March?
La Niña is a periodic cooling of the Equatorial waters of the Eastern Pacific that occurs every 3-7 years. The cooling is due to a natural cycle of anomalous winds from the east that act to push surface waters away from the coast of South America, allowing cold water from deep in the ocean to rise to the surface to replace the surface waters blown to the west. These cool waters often cause a noticeable drop in global temperatures. Conversely, when the opposite phenomena occurs--an El Niño event, which brings anomalously warm Sea Surface Temperatures (SSTs) to the Equatorial Eastern Pacific, enough heat is added to the atmosphere that global temperatures warm significantly. According to Trenberth et al. (2002), a typical El Niño event increases global temperatures by about 0.1°C. Exceptional El Niño events, such as occurred in 1997-1998 and 1982-1983, increase global temperatures by up to 0.2°C. El Niño events heat the atmosphere by causing changes in cloudiness and atmospheric circulation, and through direct radiation of heat from the ocean to the atmosphere. There is a lag of 3-6 months between the time an El Niño event occurs and the time the atmosphere heats in response. Similarly, when a La Niña event occurs, heat is drawn out of the atmosphere and the oceans are recharged with heat. Global temperatures cool, again with a lag of 3-6 months. The correlation between global temperature anomalies and El Niño/La Niña temperature anomalies can be plainly seen in Figure 2. Note that the correlation is not perfect--there are some El Niño/La Niña events that do not affect the global temperature much. For example, global temperatures did not cool much during the strong 1988-1989 La Niña event. Therefore, it is a good bet--but not certain one--that had we not had a strong La Niña event this winter, March 2008 would have been the warmest March on record, since it missed the record by only 0.04°C.
Figure 2. Comparison of temperature anomalies in the equatorial Pacific Ocean bounded by a box between 5°S, 5°N, 120°W, and 180°W (the Niño 3.4 region) and global temperatures for 1950-1998. Means for 1950-1976 and 1977-1998 (horizontal lines) are shown separately to highlight a climate shift that occurred in 1976/1977. The reasons for this shift are unknown. Note that when an El Niño event occurs, the globe tends to warm by about 0.1°C, and when a La Niña event occurs, the globe tends to cool. Image credit: American Geophysical Union's Journal of Geophysical Research.
Warmest month ever stats
It is interesting to compare what the phase of El Niño/La Niña was during each of the 12 record warmest months the globe has recorded. If we adjust for the 3-6 month lag between an El Niño/La Niña event and the monthly global temperature records, it turns out that nine of the twelve monthly records were set when an El Niño event occurred during the 3-6 month period prior to the record. Considering that climatologically El Niño conditions are present only about 25% of the time, El Niño has a major impact on when record global warmth will occur. The warmest year on record, 1998, occurred during the strongest El Niño of the past century. The table below compares the 12 monthly global temperature records with the temperature in the Niño 3.4 region (a 3-month average centered four months before the record was set). El Niño events, which occur when the Niño 3.4 index is greater than 0.4°C, are marked with an "E".
Record......Niño 3.4 index
-----------------------------
Jan 2007 +0.7 E
Feb 1998 +1.7 E
Mar 2002 -0.1
Apr 1998 +2.5 E
May 1998 +2.3 E
Jun 2005 +0.5 E
Jul 1998 +1.4 E
Aug 1998 +1.1 E
Sep 2005 +0.5 E
Oct 2003 +0.0
Nov 2004 +0.7 E
Dec 2003 +0.4
Figure 3. A La Niña event exists when ocean surface temperatures in the equatorial Pacific Ocean bounded by a box between 5°S, 5°N, 120°W, and 180°W (the Niño 3.4 region) are cooler than 0.4°C below average (based on means from 1971-2000). La Niña events between 0.5°C and 0.9°C are referred to as weak, 1.0°C and 1.4°C are moderate, and 1.5°C or cooler, strong. The winter of 2007-2008 saw strong La Niña conditions, but this has weakened to a moderate event in March. Image credit: NOAA Climate Prediction Center.
An El Niño by hurricane season?
Presence of El Niño conditions usually causes enhanced levels of wind shear over the Atlantic, reducing hurricane activity, so it would be nice to see an El Niño this Fall. The strong La Niña event we had over the past winter has weakened considerably in the past two months, and is now classified as a moderate event, according to the latest El Niño discussion issued by NOAA's Climate Prediction Center. There is some hope that an El Niño will develop by hurricane season. Two of the long-range computer models are now calling for an El Niño to develop by hurricane season (Figure 4), and none of them were calling for El Niño last month. However, there is probably not time for a full-fledged El Niño event to develop, and it is expected that we will have weak La Niña or neutral conditions this hurricane season. Since reliable El Niño records began in 1950, there has never been a switch over to El Niño by hurricane season from a La Niña as strong as the one we have now. Columbia University's International Research Institute is predicting that neutral El Niño conditions are most likely for the coming hurricane season (57% chance), with a 20% chance of an El Niño, and 23% chance of a La Niña. This is pretty much what climatology says--on average, we experience El Niño conditions 25% of the time and La Niña conditions 25% of the time.
Figure 4. Computer model forecasts of El Niño/La Niña made in April. The forecasts that go above the red line at +0.5°C denote El Niño conditions; -0.5°C to +0.5°C denote neutral conditions, and below -0.5°C denote La Niña conditions. Image credit: Columbia University's IRI.
References
Trenberth, K. E., J. M. Caron, D. P. Stepaniak, and S. Worley, >Evolution of El Niño, Southern Oscillation and global atmospheric surface temperatures", J. Geophys. Res., 107(D8), 4065, doi:10.1029/2000JD000298, 2002.
I'll be in Orlando next week for the American Meteorological Society's bi-annual hurricane conference, and plan to make some quick posts during the week to update everyone on the latest hurricane research. I may make one more post before then.
Jeff Masters
Reader Comments
Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 — Blog Index
April 13 SST forecast
April 22 SST forecast
Post 604, early tropical waves don't necessarily have to be fish storms because they are so shallow and only really have a 700mb reflection. Its when the lows start developing along the wave axis when we consider them to be fish. The cool temperatures would keep the wave in check untill they reach the 26C isotherm then usually develop thereafter as we saw in 2007.
Warm eddies in the Gulf, warm SST's spreading westward.
BRACE BRACE BRACE !!
U guys are redickilus . . . ROTFLOL
I'm getting worried that a storm will pass over the Wunderblog and we will hit a category beyond 5 due to all the excess energy in here . . .. lol
I see what ur saying about SSTs, and it just reinforces my thinking that storms will blow up nearer the northern Antilles. The other thing that keeps hitting me is that, unless we get something in the Gulf early on, the season won't get started until mid or late July, simply because the SSTs are taking a bit longer to warm. Unless we have radical warming in the next 8 weeks, I really don't see a strong possibility of a Dennis or Emily before the end of July, though I suppose the A and B storms may happen before then. I really think we are more likely to see the ATL explode in Aug and go like the Energizer Bunny for 7-8 weeks. Then MAYBE the potentially week el nino may lead to a relatively early shutdown.
Now you understand why my "eks" doesnt work!!!:0)
Yes Baha. The tropical waves usually respond dramatically when conditions are favorable especially the sea-surface temperatures.
In addition to more atmopsheric heat, humidity and interactions with the TUTT.
615. Drakoen 11:16 AM AST on April 26, 2008
Yes Baha. The tropical waves usually respond dramatically when conditions are favorable especially the sea-surface temperatures.
In addition to more atmopsheric heat, humidity and interactions with the TUTT.
Seen.
456, I do have rudimentary knowledge on NAO but thanks for trying to help.
The main effects of the positive phase of NAO was seen last winter and summer for all those who was here. Strong trades resulted in stronger than normal trade winds and more cooling of the sea surface by evaporation.
Drak, I meant longer term, but thanks for the info.
456, I do have rudimentary knowledge on NAO but thanks for trying to help.
From the CFS SLP mean, I would say that we would be in for the negative values which constitutes to a weak subtropical high.
456, the negative values causing more ridging in the cATL and a weaker ridge would force storms more westerly, but include the east coast?
There was negative phase in 2004 and a positive phase in 2007. I would say that yes, all other factors being equal. Becuz we have the issue with frontal troughs coming down from the US that help recurve storms.
It is rule of thumb that pos NAO is warm and dry for eastern US, neg NAO is cooler and wetter for eastern US (in winter especially)
These links have some excellent footage from Charley to Dean. Both have lengthy preview videos and you can order full length videos.
Storm Video
Ultimate Chase
23 04 had weak bermuda high but it was far enough west to recurve storms right into Florida. There was frontal activity that season too. We had cold front go thru N.Florida the day Charley hit the west coast. We had record lows for a day or two after.
I am off for a while. I&M!!!
A weaker ridge can also cause tropical cyclones to turn away from the eastcoast.Its all about timeing if you ask me.With the current pattern shapeing up there is no doupt that the eastcoast from florida to the carolinas are at siginficant risk this season.
I agree completely.
Later folks.
Big pos NAO was big influence on tropical activity staying far south and west and "drought monster" High over the S.E US.
It is rule of thumb that pos NAO is warm and dry for eastern US, neg NAO is cooler and wetter for eastern US (in winter especially)
-- That being the case, if we've moved to negative NAO values, would that not indicate possibly a move away from La Nina, too?
1- 1950- For florida's sake lets hope 1950 doesn't pan out.
2-1955
3-1996
4-1999
Viewing: 601 - 651
Page: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 — Blog Index