and challenges in seasonal forecasting: el niño, la niña ... · not every el niño produces the...
TRANSCRIPT
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2016-2017 Winter Outlook
and Challenges in
Seasonal Forecasting:
El Niño, La Niña, and La Nada
WINTER SEASON OUTLOOK AND IMPACTS FORUM
Las Cruces, New Mexico
October 25, 2016
Gregg Garfin, The University of Arizona
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• Seasonal forecasting• El Nino-Southern Oscillation• Focus on La Niña and New Mexico• Winter 2016-2017 Seasonal Outlook
The Next 30-45 Minutes
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• Seasonal precipitation forecasting skill depends on El Nino-Southern Oscillation
• A La Niña Watch suggests development of a weak La Niña this winter through early spring
• Forecasts predict slightly increased chances of lower seasonal precipitation and increased chances of higher seasonal temperature
Three Key Points
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NOAA Seasonal Outlooks – October 2016
http://www.cpc.ncep.noaa.gov/products/forecasts/
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Seasonal
Forecasting
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http://www.atmo.arizona.edu/students/courselinks/fall12/atmo336/lectures/sec6/modeling.html
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http://www.atmo.arizona.edu/students/courselinks/fall12/atmo336/lectures/sec6/modeling.html
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IPCC Fourth Assessment – 2007
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https://en.wikipedia.org/wiki/Canonical_correlation
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Dynamical modeling• State of the ocean• Physics of ocean and atmosphere• Ocean-atmosphere modeling
• Many runs• Many models
Elements of the Forecast
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Statistical modeling• Simple and advanced statistical methods,
using historical data• Relationship between ocean surface
temperatures and atmospheric height variations can be used to predict the time-varying changes in temperature and precipitation
Elements of the Forecast
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Consolidation and Consensus• Model agreement• Skill• Guidance from experience
Elements of the Forecast
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Example of seasonal forecast skill validationSaha et al. 2006 – Journal of Climate
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Example of seasonal forecast skill validationSaha et al. 2006 – Journal of Climate
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Example of seasonal forecast skill validationSaha et al. 2006 – Journal of Climate
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Livezey et al. 2008 – Bulletin of the American Meteorological Society
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El Niño
Southern
Oscillation
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http://www.nbc.com/saturday-night-live/video/el-nino/2861308
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“La Nada”
https://www.climate.gov/enso
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https://www.climate.gov/enso
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http://www.climas.arizona.edu/sw-climate/el-ni%C3%B1o-southern-oscillation/faq
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DRY NORTHWEST
WET SOUTHWEST
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https://www.climate.gov/enso
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https://www.climate.gov/enso
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https://www.climate.gov/enso
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http://www.climas.arizona.edu/sw-climate/el-ni%C3%B1o-southern-oscillation/faq
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Tracking
ENSO
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Typical ocean surface temperature patterns for strong La Nina (top) and strong El Nino (bottom)
https://www.climate.gov/news-features/blogs/enso/what-el-ni%C3%B1o%E2%80%93southern-oscillation-enso-nutshell
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Niño Region SST
Departures (oC) Recent
Evolution
The latest weekly SST
departures are:
Niño 4 -0.2ºC
Niño 3.4 -0.6ºC
Niño 3 -0.6ºC
Niño 1+2 -0.2ºC
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/
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SST Departures (oC) in the Tropical Pacific During the Last
Four Weeks
During the last four weeks, equatorial SSTs were below average across the central and
east-central Pacific, and near average in the eastern Pacific.
26
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/
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Explanation of many El Nino-Southern Oscillation Indices:https://www.climate.gov/news-features/blogs/enso/why-are-there-so-many-enso-indexes-instead-just-one
http://www.esrl.noaa.gov/psd/enso/dashboard.html
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http://www.esrl.noaa.gov/psd/enso/dashboard.html
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http://www.esrl.noaa.gov/psd/enso/dashboard.html
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http://www.esrl.noaa.gov/psd/enso/dashboard.html
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http://www.esrl.noaa.gov/psd/enso/dashboard.html
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Sub-Surface Temperature Departures in the Equatorial
Pacific
Most recent pentad analysis
During September and mid October, negative
temperature anomalies strengthened at depth east of
the International Date Line.
During the last two months, negative subsurface
temperature anomalies have extended to the surface
in the central and east-central Pacific Ocean.
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/
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Impacts:
Southern
New Mexico
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National Weather Service, Albuquerque, NM Forecast Officehttps://www.weather.gov/abq/clifeature_laninaprecip
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National Weather Service, Albuquerque, NM Forecast Officehttps://www.weather.gov/abq/clifeature_laninaprecip
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25 October 2016 - Winter Outlook - NM
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25 October 2016 - Winter Outlook - NM Data: Westwide Drought Tracker - http://www.wrcc.dri.edu/wwdt/
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https://www.weather.gov/abq/clifeature_laninaprecip#winter
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https://www.weather.gov/abq/clifeature_laninaprecip#winter
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https://www.weather.gov/abq/clifeature_laninaprecip#winter
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Winter
2016-2017
Climate
Outlook
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• The CPC SST Consolidation Forecast, which includes three statistical forecasts along with the CFS, predicts a weak La Niña from NDJ 2016-2017 through JFM 2017 with ENSO-neutral conditions favored thereafter.
http://www.cpc.ncep.noaa.gov/products/predictions/90day/fxus05.htm
October 20, 2016
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Summary
* Note: These statements are updated once a month (2nd Thursday of each month) in association
with the ENSO Diagnostics Discussion, which can be found by clicking here.
ENSO Alert System Status: La Niña Watch
ENSO-neutral conditions are present.*
Equatorial sea surface temperatures (SST) are
below average in the central and east-central
Pacific Ocean.
La Niña is favored to develop (~70% chance) during
the Northern Hemisphere fall 2016 and slightly
favored to persist (~55% chance) during winter
2016-17.*
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CPC/IRI Probabilistic ENSO Outlook
Updated: 13 October 2016
La Niña is favored to develop (~70% chance) during the Northern Hemisphere fall
2016 and slightly favored to persist (~55% chance) during winter 2016-17.
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/
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IRI/CPC Pacific Niño
3.4 SST Model Outlook
Figure provided by the International Research
Institute (IRI) for Climate and Society
(updated 18 October 2016).
Most multi-model averages
indicate weak La Niña conditions
during the Northern Hemisphere
fall and early winter 2016-17.
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/
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SST Outlook: NCEP CFS.v2 Forecast (PDF corrected)
Issued: 24 October 2016
The CFS.v2 ensemble mean (black dashed line) favors La Niña during the
Northern Hemisphere fall and winter 2016-17.
http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/
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http://www.cpc.ncep.noaa.gov/products/forecasts/
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NovemberthroughJanuary
Jornada Range Station
NOAA Local 3-month Temperature Outlookshttps://www.weather.gov/climate/l3mto.php
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http://www.cpc.ncep.noaa.gov/products/forecasts/
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Wet Near- Dry
Normal
Willcox Jan-March Total Precipitation 1930-2001
Year
Pre
cip
itation (
Inches) 1971-2000
Willcox Jan-March Total Precip. 1971-2000
Wet, Dry, Normal – Compared to What?
Exceedance
Probability
Normal chances are based
only on 30 years of data.The data are ranked and
divided into three categories
of equal probability, with
roughly 10 years in each
category.
33% 66%
Courtesy of Holly C. Hartmann Consulting
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Wet Near- Dry
Normal
10 years had more than 3.7 inches
10 years had less than 1.9 inches
10 years were in the middle
Willcox Jan-March Total Precipitation 1930-2001
Year
Pre
cip
itation (
Inches) 1971-2000
Willcox Jan-March Total Precip. 1971-2000
Dry
Norm
Wet
0”
1.9”
3.7”
8+”
Wet, Dry, Normal – Compared to What?
Exceedance
Probability
Courtesy of Holly C. Hartmann Consulting
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Precipitation
Made in: ASO
For: NDJ, JFMWET DRY
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Forecast Performance Evaluation
wet
dry
Courtesy of Holly C. Hartmann Consulting
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http://www.cpc.ncep.noaa.gov/products/forecasts/
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http://www.cpc.ncep.noaa.gov/products/forecasts/
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http://www.cpc.ncep.noaa.gov/products/forecasts/
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NDJ DJF
FMAJornada Range Station
NOAA Local 3-month Temperature Outlookshttps://www.weather.gov/climate/l3mto.php
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http://www.cpc.ncep.noaa.gov/products/forecasts/
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http://www.cpc.ncep.noaa.gov/products/predictions/long_range/two_class.php
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Not every El Niño produces the same effect.
La Niña has a more consistent signal, in
general, than El Niño.
The relations are not perfect, other things are
happening in the climate system.
Patterns for large events may differ in some
ways from typical ENSO patterns.
The relationship is lagged. Best associations
are found between summer/autumn index
and the following winter climate, and the
following spring and summer streamflow
runoff.
Kelly Redmond, Western Regional Climate Center
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Dry seems like a fair bet, but we
can get extreme precipitation days
during La Nina.
Warm is a good bet, but we can get
individual very cold days during La
Nina.
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Gregg GarfinSchool of Natural Resources
and Institute of the Environment
The University of Arizona
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Capotondi et al. 2015 – Understanding ENSO Diversity