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Madden-Julian Oscillation Teleconnections and Their Influence on Northern Hemisphere Winter Blocking.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Madden-Julian Oscillation Teleconnections and Their Influence on Northern Hemisphere Winter Blocking./
作者:	Henderson, Stephanie A.
面頁冊數:	1 online resource (168 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
Contained By:	Dissertation Abstracts International78-11B(E).
標題:	Atmospheric sciences. -
電子資源:	click for full text (PQDT)
ISBN:	9781369868623

Madden-Julian Oscillation Teleconnections and Their Influence on Northern Hemisphere Winter Blocking.
Henderson, Stephanie A.

Madden-Julian Oscillation Teleconnections and Their Influence on Northern Hemisphere Winter Blocking. - 1 online resource (168 pages)

Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.

Thesis (Ph.D.)--Colorado State University, 2017.

Includes bibliographical references

Winter blocking events are characterized by persistent and quasi-stationary patterns that re-direct precipitation and air masses, leading to long-lasting extreme winter weather. Studies have shown that the teleconnection patterns forced by the primary mode of tropical intraseasonal variability, the Madden-Julian Oscillation (MJO), influence extratropical factors associated with blocking, such as the North Atlantic Oscillation. However, the influence of the MJO on winter blocking is not well understood. Understanding this relationship may improve the mid-range forecasting of winter blocking and the associated weather extremes.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369868623Subjects--Topical Terms:

1179392
Atmospheric sciences.
Index Terms--Genre/Form:

554714
Electronic books.

Madden-Julian Oscillation Teleconnections and Their Influence on Northern Hemisphere Winter Blocking.
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500 $a Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
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502 $a Thesis (Ph.D.)--Colorado State University, 2017.
504 $a Includes bibliographical references
520 $a Winter blocking events are characterized by persistent and quasi-stationary patterns that re-direct precipitation and air masses, leading to long-lasting extreme winter weather. Studies have shown that the teleconnection patterns forced by the primary mode of tropical intraseasonal variability, the Madden-Julian Oscillation (MJO), influence extratropical factors associated with blocking, such as the North Atlantic Oscillation. However, the influence of the MJO on winter blocking is not well understood. Understanding this relationship may improve the mid-range forecasting of winter blocking and the associated weather extremes.
520 $a The impact of the MJO on Northern Hemisphere winter blocking is examined using a two-dimensional blocking index. Results suggest that all MJO phases demonstrate significant changes in west and central Pacific high-latitude blocking. East Pacific and Atlantic blocking are significantly suppressed following phase 3 of the MJO, characterized by anomalous convection in the tropical East Indian Ocean and suppressed convection in the west Pacific. A significant increase in east Pacific and Atlantic blocking follows the opposite-signed MJO heating during MJO phase 7. Over Europe, blocking is suppressed following MJO phase 4 and significantly increased after MJO phase 6. Results suggest that the European blocking increase may be due to two precursors: 1) a pre-existing anomalous Atlantic anticyclone, and 2) a negative Pacific North American (PNA) pattern triggered by the MJO.
520 $a The influence of the MJO on winter blocking may be different if a change occurs to the basic state and/or MJO heating, such as during El Nino -- Southern Oscillation (ENSO) events. MJO teleconnections during ENSO events are examined using composite analysis and a nonlinear baroclinic model and their influence of winter high-latitude blocking is discussed. Results demonstrate that the ENSO-altered MJO teleconnection patterns significantly influence Pacific and Atlantic blocking and the impacts depend on ENSO phase. During El Nino, Pacific and Atlantic blocking is significantly increased following MJO phase 7, with maximum Atlantic blocking frequency anomalies reaching triple the climatological winter mean blocking frequency. Results suggest that the MJO forces the initial anomalous Atlantic dipole associated with the blocking increase, and transient eddy activity aids in its persistence. During La Nina, significant changes to high-latitude blocking are mostly observed during the first half of an MJO event, with significant suppression of Pacific and Atlantic blocking following MJO phase 3.
520 $a MJO teleconnection patterns may also be altered by basic state and MJO heating biases in General Circulation Models (GCMs), important for mid-range forecasting and future climate studies of weather and climate patterns significantly altered by the MJO, such as winter blocking. Data from phase 5 of the Coupled Model Intercomparison Project (CMIP5) is used to investigate MJO teleconnection biases due to basic state and MJO biases, and a linear baroclinic model is used to interpret the results. Results indicate that poor basic state GCMs (but with a good MJO) can have equally poor skill in simulating the MJO teleconnection patterns as GCMs with a poor MJO. Large biases in MJO teleconnection patterns occur in GCMs with a zonally extended Pacific subtropical jet relative to reanalysis. In good MJO GCMs, bias in the location and horizontal structure of Indo-Pacific MJO heating is found to have modest impacts on MJO teleconnection patterns. However, East Pacific heating during MJO events can influence MJO teleconnection amplitude and the pathways over North America. Results suggest that both the MJO and the basic state must be well represented in order to properly capture the MJO teleconnection patterns.
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