Seasonal and regional signatures of ENSO in upper tropospheric jet characteristics from reanalyses

Manney, G. L.; Hegglin, Michaela I.; Lawrence, Zachary D.

doi:10.1175/jcli-d-20-0947.1

Cited by 8 publications

(13 citation statements)

References 98 publications

(107 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…NASA’s Modern-Era Retrospective Analysis for Research and Applications (MERRA-2), version 2, is an atmospheric reanalysis intended to serve as a bridge between the first MERRA reanalysis and the project’s long-term aim of developing a linked Earth system reanalysis (Akella et al 2017 ; Manney et al 2021 ). MERRA-2 incorporates observation types not accessible to MERRA’s predecessor, as well as upgrades to the Goddard Earth Observing System (GEOS) model and analytic scheme, to enable a feasible continuous climate analysis beyond MERRA’s endpoint (Gelaro et al 2017 ).…”

Section: Datasets and Methodsmentioning

confidence: 99%

Variations in the aerosol index and its relationship with meteorological parameters over Pakistan using remote sensing

Khan

Tariq

Haq

2023

Environ Sci Pollut Res

View full text Add to dashboard Cite

Particulate pollution has become a major issue in developing countries including Pakistan. Aerosols are causing severe impacts on climate and human health. To understand the effects of aerosols on the environment and human health, we must first understand their optical and physical properties. In this paper, we used ozone monitoring instrument (OMI) retrieved ultraviolet aerosol index (UVAI) to analyze spatial and temporal distribution, annual and seasonal trends of absorbing aerosols, and their relationship with meteorological parameters (e.g., temperature, relative humidity, and wind speed) over Pakistan from October 2004 to December 2021. Significant spatiotemporal changes in UVAI values were found with high values in southern and central regions and low values in northern regions of Pakistan. The mean UVAI over Pakistan showed an increasing trend of 2.89% year −1 . Seasonally, UVAI increases at the rate of 3.97% winter −1 , 3.24% autumn −1 , 0.81% summer −1 , and 0.71% spring −1 . A strong positive correlation of UVAI with precipitation and temperature (~ 0.6) is observed in the central and southern regions of Pakistan. A negative and positive correlation of −0.3223 and 0.4284 of UVAI with CO 2 emissions and primary industry is observed in Pakistan, respectively. We also found potential sources of aerosols over major cities of Pakistan using the Hybrid Single Particle Langrangian Integrated Trajectory (HYSPLIT) model. It determines that the dominant aerosols over Karachi are natural aerosols like sea salt and dust particles and anthropogenic aerosols are dominant over Lahore. Moreover, the natural and anthropogenic factors influencing absorbing aerosols are also discussed herein. Considering the outcomes of this study different methods would be used to reduce the concentration of particulate pollution like afforestation, efficient fuel energy consumption, promotion of public transport networks, etc.

show abstract

Section: Datasets and Methodsmentioning

confidence: 99%

Variations in the aerosol index and its relationship with meteorological parameters over Pakistan using remote sensing

Khan

Tariq

Haq

2023

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…MERRA-2 products have been extensively compared with those from other reanalyses and found to be well-suited for UTLS studies (e.g., Manney et al, 2017Manney et al, , 2021aHomeyer et al, 2021;Fujiwara et al, 2022;Tegtmeier et al, 2022).…”

Section: Dynamical Diagnostics Methodologymentioning

confidence: 99%

A Multi-Parameter Dynamical Diagnostics for Upper Tropospheric and Lower Stratospheric Studies

Millán

Manney

Bönisch

et al. 2023

Preprint

View full text Add to dashboard Cite

Abstract. Ozone trend estimates have shown large uncertainties in the upper troposphere/lower stratosphere (UTLS) region despite multi-decadal observations available from ground-based, balloon, aircraft, and satellite platforms. These uncertainties arise from large natural variability driven by dynamics (reflected in tropopause and jet variations) as well as the strength in constituent transport and mixing. Additionally, despite all the community efforts there is still a lack of representative high-quality global UTLS measurements to capture this variability. The Stratosphere-troposphere Processes And their Role in Climate (SPARC) Observed Composition Trends and Variability in the UTLS (OCTAV-UTLS) activity aims to reduce uncertainties in UTLS composition trend estimates by accounting for this dynamically induced variability. In this paper, we describe the production of dynamical diagnostics using meteorological information from reanalysis fields that facilitate mapping observations from several platforms into numerous geophysically-based coordinates (including tropopause and upper tropospheric jet relative coordinates). Suitable coordinates should increase the homogeneity of the air masses analyzed together, thus reducing the uncertainty caused by spatio-temporal sampling biases in the quantification of UTLS composition trends. This approach thus provides a framework for comparing measurements with diverse sampling patterns and leverages the meteorological context to derive maximum information on UTLS composition and trends and its relationships to dynamical variability. The dynamical diagnostics presented here are the first comprehensive set describing the meteorological context for multi-decadal observations by ozonesondes, lidar, aircraft, and satellite measurements in order to study the impact of dynamical processes on observed UTLS trends by different sensors on different platforms. Examples using these diagnostics to map multi-platform datasets into different geophysically-based coordinate systems are provided. The diagnostics presented can also be applied to analysis of greenhouse gases other than ozone that are relevant to surface climate and UTLS chemistry.

show abstract

“…Despite the jet's proximity to the Hadley Cell edge, it has much weaker trends than observed in the Hadley Cell (e.g., Archer & Caldeira, 2008; Davis & Rosenlof, 2012; Fu & Lin, 2011; Maher et al, 2020), pointing to a gap in our current understanding of subtropical jet dynamics. Regional or synoptic, rather than hemispheric, analyses of subtropical jet behavior in the Australian sector (e.g., Frederiksen & Osbrough, 2022; Gillett et al, 2021; Liu et al, 2021; Manney et al, 2021) improve understanding of trends and the dynamical relationship between the subtropical jet and Hadley Cell.…”

Section: Large‐scale Extratropical Circulationmentioning

confidence: 99%

Can southern Australian rainfall decline be explained? A review of possible drivers

McKay

Boschat

Rudeva

et al. 2023

WIREs Climate Change

View full text Add to dashboard Cite

Southern Australia's rainfall is highly variable and influenced by factors across scales from synoptic weather to large-scale circulation and remote climate modes of variability. Anthropogenic climate change and natural variability modulate these factors and their interactions. However, studies often focus on changes in selected parts of the climate system with less emphasis on the system as a whole. As such, it is difficult to gain a complete understanding of how southern Australia's rainfall responds to broad-scale changes in the climate system. We step through the existing literature on long-term changes in synoptic-to-large-scale atmospheric circulation and drivers of climate variability to form a more complete story of rainfall changes across southern Australia. This process reveals that the most robust change is the observed winter decline in rainfall as it is consistent with several changing climatic factors: decreasing rainfall from weather systems, strengthening subtropical ridge, poleward shifts in the Hadley Cell and the Southern Annular Mode, and increasing frequency of positive Indian Ocean Dipole events. In other seasons, particularly summer, changes in atmospheric circulation and drivers may not agree with observed rainfall changes, highlighting gaps in our knowledge of atmospheric dynamics and climate change processes. Future work should focus on research across temporal-and spatial-scales, better understanding of jet interactions, the influence of stratospheric processes on the troposphere, and instances of contrasting trends in drivers and southern Australian rainfall changes.

show abstract

Seasonal and regional signatures of ENSO in upper tropospheric jet characteristics from reanalyses

Cited by 8 publications

References 98 publications

Variations in the aerosol index and its relationship with meteorological parameters over Pakistan using remote sensing

Variations in the aerosol index and its relationship with meteorological parameters over Pakistan using remote sensing

A Multi-Parameter Dynamical Diagnostics for Upper Tropospheric and Lower Stratospheric Studies

Can southern Australian rainfall decline be explained? A review of possible drivers

Contact Info

Product

Resources

About