Search Results

You are looking at 21 - 23 of 23 items for :

  • Author or Editor: Ibrahim Hoteit x
  • Refine by Access: All Content x
Clear All Modify Search
Raju Attada
,
Hari Prasad Dasari
,
Ravi Kumar Kunchala
,
Sabique Langodan
,
Kondapalli Niranjan Kumar
,
Omar Knio
, and
Ibrahim Hoteit

Abstract

This study investigates the sensitivity of winter seasonal rainfall over the Arabian Peninsula (AP) to different convective physical parameterization schemes using a high-resolution WRF Model. Three different parameterization schemes, Kain–Fritch (KF), Betts–Miller–Janjić (BMJ), and Grell–Freitas (GF), are used in winter simulations from 2001 to 2016. Results from seasonal simulations suggest that simulated AP winter rainfall with KF is in best agreement with observed rainfall in terms of spatial distribution and intensity. Higher spatial correlation coefficients and fewer biases with observations are also obtained with KF. In addition, the regional moisture transport, cloud distribution, and cloud microphysical responses are better simulated by KF. The AP low-level circulation, characterized by the Arabian anticyclone, is well captured by KF and BMJ, but its position is displaced in GF. KF is furthermore successful at simulating the moisture distribution in the lower atmosphere and atmospheric water plumes in the middle troposphere. The higher skill of rainfall simulation with the KF (and to some extent BMJ) is attributed to a better representation of the Arabian anticyclone and subtropical westerly jet, which guides the upper tropospheric synoptic transients and moisture. In addition, the vertical profile of diabatic heating from KF is in better agreement with the observations. Discrepancies in representing the diabatic heating profile by BMJ and GF show discrepancies in instability and in turn precipitation biases. Our results indicate that the selection of subgrid convective parameterization in a high-resolution atmospheric model over the AP is an important factor for accurate regional rainfall simulations.

Free access
Ibrahim Hoteit
,
Yasser Abualnaja
,
Shehzad Afzal
,
Boujemaa Ait-El-Fquih
,
Triantaphyllos Akylas
,
Charls Antony
,
Clint Dawson
,
Khaled Asfahani
,
Robert J. Brewin
,
Luigi Cavaleri
,
Ivana Cerovecki
,
Bruce Cornuelle
,
Srinivas Desamsetti
,
Raju Attada
,
Hari Dasari
,
Jose Sanchez-Garrido
,
Lily Genevier
,
Mohamad El Gharamti
,
John A. Gittings
,
Elamurugu Gokul
,
Ganesh Gopalakrishnan
,
Daquan Guo
,
Bilel Hadri
,
Markus Hadwiger
,
Mohammed Abed Hammoud
,
Myrl Hendershott
,
Mohamad Hittawe
,
Ashok Karumuri
,
Omar Knio
,
Armin Köhl
,
Samuel Kortas
,
George Krokos
,
Ravi Kunchala
,
Leila Issa
,
Issam Lakkis
,
Sabique Langodan
,
Pierre Lermusiaux
,
Thang Luong
,
Jingyi Ma
,
Olivier Le Maitre
,
Matthew Mazloff
,
Samah El Mohtar
,
Vassilis P. Papadopoulos
,
Trevor Platt
,
Larry Pratt
,
Naila Raboudi
,
Marie-Fanny Racault
,
Dionysios E. Raitsos
,
Shanas Razak
,
Sivareddy Sanikommu
,
Shubha Sathyendranath
,
Sarantis Sofianos
,
Aneesh Subramanian
,
Rui Sun
,
Edriss Titi
,
Habib Toye
,
George Triantafyllou
,
Kostas Tsiaras
,
Panagiotis Vasou
,
Yesubabu Viswanadhapalli
,
Yixin Wang
,
Fengchao Yao
,
Peng Zhan
, and
George Zodiatis

Abstract

The Red Sea, home to the second-longest coral reef system in the world, is a vital resource for the Kingdom of Saudi Arabia. The Red Sea provides 90% of the Kingdom’s potable water by desalinization, supporting tourism, shipping, aquaculture, and fishing industries, which together contribute about 10%–20% of the country’s GDP. All these activities, and those elsewhere in the Red Sea region, critically depend on oceanic and atmospheric conditions. At a time of mega-development projects along the Red Sea coast, and global warming, authorities are working on optimizing the harnessing of environmental resources, including renewable energy and rainwater harvesting. All these require high-resolution weather and climate information. Toward this end, we have undertaken a multipronged research and development activity in which we are developing an integrated data-driven regional coupled modeling system. The telescopically nested components include 5-km- to 600-m-resolution atmospheric models to address weather and climate challenges, 4-km- to 50-m-resolution ocean models with regional and coastal configurations to simulate and predict the general and mesoscale circulation, 4-km- to 100-m-resolution ecosystem models to simulate the biogeochemistry, and 1-km- to 50-m-resolution wave models. In addition, a complementary probabilistic transport modeling system predicts dispersion of contaminant plumes, oil spill, and marine ecosystem connectivity. Advanced ensemble data assimilation capabilities have also been implemented for accurate forecasting. Resulting achievements include significant advancement in our understanding of the regional circulation and its connection to the global climate, development, and validation of long-term Red Sea regional atmospheric–oceanic–wave reanalyses and forecasting capacities. These products are being extensively used by academia, government, and industry in various weather and marine studies and operations, environmental policies, renewable energy applications, impact assessment, flood forecasting, and more.

Full access
Ibrahim Hoteit
,
Yasser Abualnaja
,
Shehzad Afzal
,
Boujemaa Ait-El-Fquih
,
Triantaphyllos Akylas
,
Charls Antony
,
Clint Dawson
,
Khaled Asfahani
,
Robert J. Brewin
,
Luigi Cavaleri
,
Ivana Cerovecki
,
Bruce Cornuelle
,
Srinivas Desamsetti
,
Raju Attada
,
Hari Dasari
,
Jose Sanchez-Garrido
,
Lily Genevier
,
Mohamad El Gharamti
,
John A. Gittings
,
Elamurugu Gokul
,
Ganesh Gopalakrishnan
,
Daquan Guo
,
Bilel Hadri
,
Markus Hadwiger
,
Mohammed Abed Hammoud
,
Myrl Hendershott
,
Mohamad Hittawe
,
Ashok Karumuri
,
Omar Knio
,
Armin Köhl
,
Samuel Kortas
,
George Krokos
,
Ravi Kunchala
,
Leila Issa
,
Issam Lakkis
,
Sabique Langodan
,
Pierre Lermusiaux
,
Thang Luong
,
Jingyi Ma
,
Olivier Le Maitre
,
Matthew Mazloff
,
Samah El Mohtar
,
Vassilis P. Papadopoulos
,
Trevor Platt
,
Larry Pratt
,
Naila Raboudi
,
Marie-Fanny Racault
,
Dionysios E. Raitsos
,
Shanas Razak
,
Sivareddy Sanikommu
,
Shubha Sathyendranath
,
Sarantis Sofianos
,
Aneesh Subramanian
,
Rui Sun
,
Edriss Titi
,
Habib Toye
,
George Triantafyllou
,
Kostas Tsiaras
,
Panagiotis Vasou
,
Yesubabu Viswanadhapalli
,
Yixin Wang
,
Fengchao Yao
,
Peng Zhan
, and
George Zodiatis
Full access