Search Results - "stratosphere"

South America's tropopause variability in relation to global teleconnection (2001–2017): A GNSS-radio occultation assessment by Nascimento, A.A., Awange, Joseph, Gonçalves, R.M., Khandu

Subjects: Get full text

GNSS radio occultation in-filling of the African radiosonde data gaps reveals drivers of tropopause climate variability by Ding, Tong, Awange, Joseph, Scherllin-Pirscher, Barbara, Kuhn, Michael, Nakhap, Khandu, Anyah, Richard, Zerihun, Ayalsew, Luyen, Bui Khac

Subjects: Get full text

Development of unmanned aerial vehicle (UAV) based high altitude balloon (HAB) platform for active aerosol sampling by Lateran, S., Sedan, M. F., Mohd Harithuddin, Ahmad Salahuddin, Md Ali, Syaril Azrad

“…The knowledge on the abundance and diversity of the minute particles or aerosols in the earth's stratosphere is still in its infancy as aerosol sampling at high-altitude still possess a lot of challenges. …”
Get full text
Get full text

High-precision dating of the Kalkarindji large igneous province, Australia, and synchrony with the Early–Middle Cambrian (Stage 4–5) extinction by Jourdan, Fred, Hodges, K., Sell, B., Schaltegger, U., Wingate, M., Evins, L., Söderlund, U., Haines, P., Phillips, D., Blenkinsop, T.

“…Sulfur concentration measurements ranging from <50 to 1900 µg/g, and fractal analysis of extensive explosive volcanic breccias, suggest that blasts and phreatomagmatic explosions have contributed to injection of large amounts of sulfur into the stratosphere. In addition, magma intrusions in oil, gas, and sulfate deposits may have generated significant emission of CH4 and SO2 which, along with volcanic gases, would have combined to cause an oscillation of the climate and led to the Cambrian extinction.…”
Get full text

Rotational speed analysis on double rotating cylinder for cylinder to flat plate using numerical method by Roslan, Muhammad Syakir Iman, Mohammad Ali, Hidayatullah, Mohd Rafie, Azmin Shakrine

“…The cylinder-to-flat plate embedment is a new invention for the unmanned aerial vehicle which is intended to fly in the stratosphere region for surveillance purposes with the embedment of a double rotating cylinder and flat plate. …”
Get full text

Climate hypersensitivity to solar forcing? by Soon, W., Posmentier, E., Baliunas, S.

“…The proposed solar forcing mechanism should be further confirmed using other models (e.g., general circulation models) that may better capture radiative and dynamical couplings of the troposphere and stratosphere.…”
Get full text
Get full text

Satellite Observations for Identifying Continental-Scale Climate Change over Australia by Fleming, Kevin, Awange, Joseph, Kuhn, Michael, Featherstone, Will

“…The first involves the use of radio occultation measurements based on signals from Global Navigation Satellite Systems (GNSS) spacecraft made by low-Earth orbiting (LEO) satellites to identify changes in the height of the tropopause, a sensitive indicator of climate change owing to its response to temperature changes in the troposphere and lower stratosphere. The second deals with rainfall over Australia, as measured by the Tropical Rainfall Monitoring Mission (TRMM), in conjunction with other satellite- and ground-based observations. …”
Get full text

Performance of CDMA power control for HAPS by S Abdulwafi, Tahani Almehdi

“…In parallel with terrestrial and satellite wireless networks, a new alternative based on platforms located in the stratosphere has recently introduced, known as High Altitude Platforms (HAPS). …”
Get full text
Get full text
Get full text

Interannual variability of temperature in the UTLS region over Ganges-Brahmaputra-Meghna river basin based on COSMIC GNSS RO data by Khandu, Awange, Joseph, Forootan, E.

“…Poor reliability of radiosonde records across South Asia imposes serious challenges in understanding the structure of upper-tropospheric and lower-stratospheric (UTLS) region. The Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) mission launched in April 2006 has overcome many observational limitations inherent in conventional atmospheric sounding instruments. …”
Get full text

Stability of CubeSat Clocks and Their Impacts on GNSS Radio Occultation by Allahvirdizadeh, Amir, Awange, Joseph, El-Mowafy, Ahmed, Ding, Tong, Wang, Kan

“…Global Navigation Satellite Systems’ radio occultation (GNSS-RO) provides the upper troposphere-lower stratosphere (UTLS) vertical atmospheric profiles that are complementing radiosonde and reanalysis data. …”
Get full text
Get full text

Distribution, variability and sources of tropospheric ozone over south China in spring: intensive ozonesonde measurements at five locations and modeling analysis by Zhang, Yiqiang, Liu, Hongyu, Crawford, James H., Considine, David B., Chan, Chuenyu, Oltmans, Samuel J., Thouret, Valerie

“…Lightning NOx emissions (over South Asia and equatorial Africa) and/or stratospheric influences were responsible for major events of high O3 observed in the UT/MT at all stations. …”
Get full text

Spatial distribution of toxic Alexandrium tamiyavanichii (Dinophyceae) in the southeastern South China Sea-Sulu Sea: A molecular-based assessment using real-time quantitative PCR (... by Nyuk, Fong Kon, Sing, Tung Teng, Kieng, Soon Hii, Leh, Hie Yek, Aazani, Mujahid

“…Plankton samples were collected from 71 stations during a scientific cruise from the Research Vessel Sonne as part of the joint EU project on Stratosphere ozone: Halogens in a Varying Atmosphere (SHIVA), conducted in November 2011. …”
Get full text
Get full text

Computational aerodynamics analysis on pitching moment using ducted fan over flat plate for high altitude platform station by Muhd Arif, Nur Liyana Sabrina, Mohammad Ali, Hidayatullah, Mohd Rafie, Azmin Shakrine

“…It is essentially developed to be applied as unmanned aerial vehicle (UAV) and high altitude platform station (HAPS) for surveillance purposes that can fly in the stratosphere region. In previous study of CyFlaP, the presence of a moment force acting at the centre of its body is shown to affect its stability during flight. …”
Get full text
Get full text

Wind profiles in Peninsular Malaysia : a comprehensive upper air analysis by Mohd Shahidi Alias, Azmin Shakrine Mohd Rafie, Mohd Faisal Abdul Hamid, Ezanee Gires, Khairul Dahri Mohd Aris

“…The 3rd peak was located at the stratosphere layer from 18,000 m to 32,000 m altitude (average wind speed of 15.2 ms-1). …”
Get full text
Get full text

Wind profiles in Peninsular Malaysia: a comprehensive upper air analysis by Alias, Mohd Shahidi, Mohd Rafie, Azmin Shakrine, Abdul Hamid, Mohd Faisal, Gires, Ezanee, Mohd Aris, Khairul Dahri

“…The 3rd peak was located at the stratosphere layer from 18,000 m to 32,000 m altitude (average wind speed of 15.2 ms-1). …”
Get full text
Get full text

A business plan for a startup of an event e-marketplace and planning solution in Malaysia by Khalil, Nadiah

“…Event Planning Module to match the needs of the spectrum of customers within the social events stratosphere. There will be three different level of subscriptions for the E-marketplace starting with ‘Freemium’ and elevated to Pro with the increase of functionalities. …”
Get full text

Emission of short-lived halocarbons by selected tropical marine phytoplankton / Lim Yong Kian by Lim, Yong Kian

“…Biogenic volatile halocarbons contribute free halogen radicals to the troposphere and stratosphere, and may play a role in the catalytic destruction of the ozone layer. …”
Get full text
Get full text
Get full text

Study on copper incorporated mesoporous silica SBA-15 for N2O catalytic decomposition by Mohd Haizal, Mohd Husin

“…Nitrous oxide (N20) is an environmental pollutant because it is a relatively strong greenhouse effect gas and contributes towards the destruction of ozone in the stratosphere. Direct decomposition of N20 by catalysts represents one of the potential solutions to minimize N20 emissions. …”
Get full text
Get full text

Solar ultraviolet radiation in a changing climate by Williamson, C., Zepp, R., Lucas, R., Madronich, S., Austin, A., Ballaré, C., Norval, M., Sulzberger, B., Bais, A., McKenzie, R., Robinson, S., Häder, D., Paul, N., Bornman, Janet

“…We highlight the complex interactions between the drivers of climate change and those of stratospheric ozone depletion, and the positive and negative feedbacks among climate, ozone and ultraviolet radiation. …”
Get full text

GNSS sensing of climate variability by Awange, Joseph

“…Poor reliability of radiosonde records across most developing countries in the southern hemisphere imposes serious challenges in understanding the structure of upper-tropospheric and lower-stratospheric (UTLS) region, i.e., the tropopause. The Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) mission launched in April 2006 has overcome many observational limitations inherent in conventional atmospheric sounding instruments.…”
Get full text