Mesoscale Convective Systems as a source of electromagnetic signals registered by ground-based system and DEMETER satellite

Mesoscale Convective Systems (MCS) are especially visible in the summertime, when there is an advection of warm maritime air from the West. Advection of air masses is enriched by water vapour, which source can be found over the Mediterranean Sea. In propitious atmospheric conditions, thus significant convection, atmospheric instability or strong vertical thermal gradient, lead to the development of strong thunderstorm systems. In this paper we discuss one case of MCS, which generated a significant amount of +CG, -CG and IC discharges. We have focused on the ELF (Extremely Low Frequencies,

LITTORAL STATES’ DEFENSE DIPLOMACY IN MALACCA STRAIT THROUGH THE MALACCA STRAIT PATROL FRAMEWORK

<p>Malacca Strait, as one of the strategic straits in world trade, often face various non-traditional security threats. In accordance with United Nations Convention on the Law of The Sea (UNCLOS), littoral states such as Indonesia, Singapore, and Malaysia are obligated to maintain the security in Malacca Straits, to ensure that world trades and world economic are not disrupted. This study analyzes how the Malacca straits patrol (MSP) framework is formed by littoral states in order to maintain the security stability in Malacca Strait. The authors employ qualitative method through literature study. The obtained data were analyzed using the theory of defense cooperation and concept of defense diplomacy. The results of the study conclude that MSP, which is consisted of the Malacca Straits Sea Patrol (MSSP), "Eyes-in-the-Sky" Combined Maritime Air Patrols (EiS), and the MSP Intelligence Exchange Group (IEG), is classified as a defense diplomacy activity in the form of multilateral contacts between military officials and multilateral military exercises aimed at increasing mutual trust and defense capabilities of each country.</p><p><strong>Keywords:</strong> Malacca Strait, Malacca Straits Patrol Framework, Threat, Defense Cooperation, Defense Diplomacy</p>

DIPLOMASI PERTAHANAN LITTORAL STATES DI SELAT MALAKA MELALUI KERANGKA PATROLI SELAT MALAKA

<p>Selat Malaka sebagai salah satu selat yang memiliki nilai strategis dalam perdagangan dunia kerap menghadapi berbagai ancaman keamanan non-tradisional. Sesuai dengan UNCLOS, littoral states seperti Indonesia, Singapura, dan Malaysia berkewajiban untuk menjaga keamanan di wilayah perairan Selat Malaka agar perdagangan dan ekonomi dunia tidak terganggu. Penelitian ini menganalisis bagaimana kerangka kerjasama Malacca Straits Patrol (MSP) dibentuk sebagai sebuah kerjasama yang dibentuk oleh littoral states dalam rangka menjaga stabilitas keamanan di wilayah perairan Selat Malaka. Peneliti menggunakan metode penelitian kualitatif melalui studi pustaka. Data yang diperoleh dianalisis menggunakan konsep kerja sama pertahanan dan diplomasi pertahanan. Hasil penelitian menjelaskan bahwa MSP yang terdiri atas Malacca Straits Sea Patrol (MSSP), “Eyes-in-the-Sky” Combined Maritime Air Patrols (EiS), dan MSP Intelligence Exchange Group (IEG) merupakan salah satu bentuk aktivitas diplomasi pertahanan berupa multilateral contacts between military officials dan multilateral military exercise yang bertujuan untuk meningkatkan rasa percaya dan kapabilitas pertahanan masing-masing negara.</p><p><strong>Kata Kunci :</strong> selat malaka, the malacca straits patrol framework, ancaman, kerjasama pertahanan, diplomasi pertahanan</p>

Radiocarbon in the Maritime Air and Sea Surface Water of the South China Sea

ABSTRACTRadiocarbon (14C) generated by the thermonuclear tests in the late 1950s to early 1960s has been used as a tracer to study atmospheric and oceanic circulations, carbon exchange between different reservoirs, and fossil fuel emissions. Here we report the first measurements of 14C in atmospheric CO2 of maritime air collected over the South China Sea (SCS) during July 2014. We also present 14C of the dissolved inorganic carbon (DIC) in the sea surface water in the same region. Most of the Δ14C values of the atmospheric CO2 vary in the range of 15.6±1.6‰– 22.0±1.6‰, indicating that the central SCS maritime air is well-mixed and consistent with the clean background air in the Northern Hemisphere. The 14C values of the DIC (DI14C) in the surface seawater vary between 28.3±2.5‰ and 40.6±2.7‰, mainly due to the lateral mixing between the SCS and western Pacific. The average surface seawater DI14C is 15.4 ± 5.1‰ higher than that of the maritime air 14CO2. The reversal of the sea–air Δ14C gradient occurred at ∼2000, marking the start of the upper ocean transferring bomb 14C back to the atmosphere in the SCS.

Air quality modelling in the summer over the Eastern Mediterranean using WRF/Chem: Chemistry and aerosol mechanisms intercomparison

We employ the WRF/Chem model to study summertime air pollution, the intense photochemical activity and their impact on air quality over the Eastern Mediterranean. We utilize three nested domains with horizontal resolution of 80 km-16 km-4 km, with the finest grid focusing on the island of Cyprus, where the CYPHEX campaign took place in July, 2014. Anthropogenic emissions are based on the EDGAR HTAP global emission inventory, while dust and biogenic emissions are calculated online. Three simulations utilizing the CBMZ-MOSAIC, MOZART-MOSAIC, and RADM2-MADE/SORGAM gas-phase and aerosol mechanisms are performed. The results are compared with measurements from a dense observational network of 14 ground stations in Cyprus. The model simulates T2 m, Psurf, and WD10 m accurately, with minor differences in WS10 m between model and observations at coastal and mountainous stations attributed to limitations in the representation of the complex topography in the model. It is shown that the south-eastern part of Cyprus is mostly affected by emissions from within the island, under the dominant (60 %) westerly flow during summertime. Clean maritime air from the Mediterranean can reduce concentrations of local air pollutants over the region during westerlies. Ozone concentrations are overestimated by all three mechanisms (9 %