Resolution Dependency of Numerically Simulated Stratosphere-to-Troposphere Transport Associated with Mid-Latitude Closed Cyclones in Early Spring around Japan

Yamashita, Yousuke; Takigawa, Masayuki; Ishijima, Kentaro; Akiyoshi, Hideharu; Kodama, Chihiro; Yashiro, Hisashi; Satoh, Masaki

doi:10.2151/sola.2017-034

Cited by 3 publications

(2 citation statements)

References 44 publications

(46 reference statements)

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“…Spatial resolution of chemical transport model (CTM) based on Eulerian formulation has substantial effects on model simulation results through resolving emission distributions (Valari & Menut, 2008), nonlinear chemical processes (Valin et al., 2011; Wild & Prather, 2006), and meteorological fields which affects tracer transport, deposition, and photolysis and reaction rates (Klich & Fuelberg, 2014; Tie et al., 2010). High‐resolution global modeling is also essential for Eulerian models to improve advection calculation of polluted plumes (Eastham & Jacob, 2017; Prather et al., 2008) and capture episodic deep intrusions from the stratosphere and their influence on near‐surface ozone, including their inter‐continental transports (M. Lin et al., 2012; Yamashita et al., 2017), through suppressing numerical diffusion at coarse resolutions. Lagrangian models do not suffer from numerical diffusion, while the use of Lagrangian models for global calculations has difficulties with accumulated errors in trajectories over time, heterogeneous coverages of air parcels after long time integration, and a lack of mixing with neighbor air parcels and subsequent nonlinear chemistry (e.g., Brasseur & Jacob, 2017).…”

Section: Introductionmentioning

confidence: 99%

Impacts of Horizontal Resolution on Global Data Assimilation of Satellite Measurements for Tropospheric Chemistry Analysis

Sekiya

Miyazaki

Ogochi

et al. 2021

J Adv Model Earth Syst

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We present the results from a global 0.56°‐resolution chemical data assimilation that integrates satellite observations of ozone, NO2, CO, HNO3, and SO2 from OMI, GOME‐2, SCIAMACHY, TES, MOPITT, and MLS. The assimilation is based on an ensemble Kalman filter technique and simultaneously optimizes ozone precursor emissions and concentrations of various species. The data assimilation at 0.56° resolution reduced model errors against independent surface, aircraft, and ozonesonde observations, which was larger than at coarser resolutions for many cases. By the data assimilation, surface model errors over major polluted regions were reduced by 33%–75% for NO2 and by 15%–18% for ozone. Agreements against assimilated observations for NO2 were improved using the data assimilation at 0.56° resolution by a factor of 1.5–3 compared to 2.8° resolution over major polluted regions. The estimated global total NOx emission over medium and strong source areas were smaller by 15% at 0.56° resolution than at 2.8° resolution associated with resolving small‐scale transport and chemistry processes, while 2%–26% smaller emissions were found for regional total emissions over Europe, the United States, China, India, and South Africa, with larger differences over megacities such as Los Angeles (−41%). The estimated ship emissions were 5%–7% smaller at 0.56° resolution over the Pacific and Atlantic. The 0.56°‐resolution data assimilation provides globally consistent analyses of the emissions and concentrations on a megacity scale, which benefit studies on air quality and its impact on human health at various spatial scales over different regions of the world.

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Section: Introductionmentioning

confidence: 99%

Impacts of Horizontal Resolution on Global Data Assimilation of Satellite Measurements for Tropospheric Chemistry Analysis

Sekiya

Miyazaki

Ogochi

et al. 2021

J Adv Model Earth Syst

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“…Height-based schemes with local minimum searching have been used in many studies to identify cutoff lows (e.g., Kentarchos and Davies 1998;Nieto et al 2005;Zhang et al 2008;Favre et al 2012;Yamashita et al 2017;Wen et al 2018;Pinheiro et al 2019Pinheiro et al , 2020see Nieto et al 2008;Pinheiro et al 2017 for reviews). The scheme proposed by Nieto et al (2005) has been widely used with additional conditions imposed on it (Nieto et al 2007;Porcù et al 2007;Nieto et al 2008;Ndarana and Waugh 2010;Reboita et al 2010;Abatzoglou 2016;Barbero et al 2019;Muñoz et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Seamless Detection of Cutoff Lows and Preexisting Troughs

Kasuga

Honda

Ukita

et al. 2021

Monthly Weather Review

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We propose a new scheme based on geopotential height fields to detect cutoff lows starting in the preexisting trough stage. The intensity and scale derived from the proposed scheme will allow for a better understanding of the cutoff low life cycle. These cutoff lows often accompany mesoscale disturbances, causing adverse weather-related events, such as intense torrential rainfall and/or tornadoes. The proposed scheme quantifies the geometric features of a depression from its horizontal height profile. The height slope of a line intersecting the depression bottom and the nearest tangential point (optimal slope) locally indicates the intensity and scale of an isolated depression.The strength of the proposed scheme is that, by removing a local background height slope from a geopotential height field, the cutoff low and its preexisting trough are seamlessly detected as an identical depression. The distribution maps for the detected cutoff lows and preexisting troughs are illustrated along with their intensities, sizes, and local background flows estimated from snapshot height fields. We conducted climatological comparisons of cutoff lows to determine the utility of the proposed scheme.

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Detection of stratospheric intrusion events and their role in ozone enhancement at a mountain background site in sub-tropical East Asia

Ou-Yang

Babu

Lee

et al. 2022

Atmospheric Environment

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Resolution Dependency of Numerically Simulated Stratosphere-to-Troposphere Transport Associated with Mid-Latitude Closed Cyclones in Early Spring around Japan

Abstract: The resolution dependency of simulated stratosphere-to-

Cited by 3 publications

References 44 publications

Impacts of Horizontal Resolution on Global Data Assimilation of Satellite Measurements for Tropospheric Chemistry Analysis

Impacts of Horizontal Resolution on Global Data Assimilation of Satellite Measurements for Tropospheric Chemistry Analysis

Seamless Detection of Cutoff Lows and Preexisting Troughs

Detection of stratospheric intrusion events and their role in ozone enhancement at a mountain background site in sub-tropical East Asia

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