scholarly journals PENGARUH MADDEN-JULIAN OSCILLATION TERHADAP DISTRIBUSI TEMPORAL DAN PROPAGASI HUJAN BERDASARKAN PENGAMATAN RADAR CUACA (Studi Kasus : Intensive Observation Period 2016 di Wilayah Jakarta dan Sekitarnya)

2017 ◽  
Vol 18 (2) ◽  
pp. 43
Author(s):  
Ardhi Adhary Arbain ◽  
Findy Renggono ◽  
Rino Bahtiar Yahya
Keyword(s):  
Temporal Distribution ◽  
Early Morning ◽  
Madden Julian Oscillation ◽  
Maritime Continent ◽  
Meridional Component ◽  
Strengthen Effect ◽  
Intensive Observation ◽  
Constant Altitude ◽  
Position Indicator ◽  
Observation Period

IntisariDistribusi temporal dan propagasi hujan selama Intensive Observation Period 2016 (IOP 2016, 18 Januari – 16 Februari 2016) di wilayah Jakarta dan sekitarnya dianalisis berdasarkan rataan longitudinal dan latitudinal data Constant Altitude Plan Position Indicator (CAPPI) radar cuaca, pada periode sebelum, saat dan sesudah fase aktif Madden-Julian Oscillation (MJO). Hasil analisis menunjukkan bahwa distribusi temporal hujan berkurang secara signifikan pada periode MJO aktif dan sesudah MJO, terutama pada dini hari. Di sisi lain, intensitas hujan semakin meningkat dengan nilai rata-rata di atas 30 mm/jam pada periode setelah MJO. Pada komponen zonal, arah propagasi hujan umumnya dominan dari barat ke timur pada ketiga periode analisis, sedangkan untuk komponen meridional, terdapat variasi yang cukup signifikan pada periode saat dan setelah MJO aktif . Pergerakan hujan dari selatan ke utara pada kedua periode tersebut menunjukkan pengaruh siklus diurnal yang semakin kuat dibandingkan pengaruh monsun, setelah MJO melintasi wilayah barat Benua Maritim Indonesia.   AbstractTemporal distribution and propagation of rainfall during Intensive Observation Period 2016 campaign (IOP 2016, January 18 – February 16, 2016) in Jakarta and surrounding area were investigated based on the longitudinal dan latitudinal averages of Constant Altitude Plan Position Indicator (CAPPI) dataset of weather radar, during the active Madden-Julian Oscillation (MJO) phase, as well as, pre-MJO and post-MJO periods. The results show a significant decrease of rainfall temporal distribution during the active MJO and post-MJO periods, particularly in the early morning, meanwhile, the rainfall intensity shows significant increase, with the averages of more than 30 mm/hr during the post-MJO period. On the zonal component, the rainfall mostly has eastward propagation for all period while having more significant variations on the meridional component during the active and post-MJO periods. Northward rainfall propagation during the active and post-MJO periods indicates the strengthen effect of diurnal cycle over monsoon after the MJO passed by the western part of Indonesian Maritime Continent.  

scholarly journals KARAKTERISTIK TEMPORAL DAN SPASIAL CURAH HUJAN PENYEBAB BANJIR DI WILAYAH DKI JAKARTA DAN SEKITARNYA

2016 ◽  
Vol 17 (1) ◽  
pp. 21
Author(s):  
Destianingrum Ratna Prabawadhani ◽  
Budi Harsoyo ◽  
Tri Handoko Seto ◽  
Bayu Rizky Prayoga
Keyword(s):  
Temporal Distribution ◽  
Tropical Rainfall Measuring Mission ◽  
Middle Part ◽  
Total Rainfall ◽  
Tropical Rainfall ◽  
Know How ◽  
Research Activities ◽  
Precipitation Characteristics ◽  
Intensive Observation ◽  
Observation Period

IntisariCurah hujan merupakan faktor utama penyebab banjir, tidak terkecuali banjir di wilayah DKI Jakarta. Oleh karena itu, karakteristik curah hujan perlu dipelajari untuk tujuan mitigasi bencana banjir di wilayah Ibukota. Kegiatan riset IOP (Intensive Observation Period) yang telah dilaksanakan oleh BPPT dan BMKG pada tanggal 18 Januari 2016 hingga 16 Februari 2016 bertujuan untuk mengetahui karakteristik atmosfer yang menyebabkan cuaca ekstrim di sekitar wilayah DKI Jakarta. Tulisan ini secara lebih spesifik membahas karakteristik curah hujan dari data satelit TRMM JAXA (Tropical Rainfall Measuring Mission) di Wilayah DKI Jakarta dan sekitarnya, untuk mengetahui bagaimana distribusinya baik secara temporal maupun spasial. Dari hasil pengamatan selama periode kegiatan IOP dapat diketahui bahwa secara temporal distribusi curah hujan yang memiliki intensitas tinggi terjadi pada siang hari (mulai pukul 13.00 WIB) hingga malam hari (pukul 24.00 WIB) dengan intensitas tertinggi terjadi pada rentang waktu antara pukul 13.00 sampai dengan 18.00 WIB. Secara spasial total hujan tertinggi selama periode IOP terpusat di daerah sekitar perbatasan antara Provinsi DKI Jakarta (Jakarta Selatan), Provinsi Jawa Barat (Depok), dan Provinsi Banten (Kota Tangerang Selatan) dengan total curah hujan berkisar antara 600 mm hingga lebih dari 650 mm. Suplai utama curah hujan terbesar adalah hujan-hujan yang terjadi di daerah Selatan hingga bagian tengah Provinsi DKI Jakarta.  Abstract Rainfall is a major factor causing flooding, no exception flooding in Jakarta. Therefore, precipitation characteristics need to be studied for the purpose of flood mitigation in the Capital region. Research activities IOP (Intensive Observation Period) have been conducted by BPPT and BMKG on January 18, 2016 until February 16, 2016 aims to determine the characteristics of the atmosphere that causes extreme weather around Jakarta. This paper more specifically discusses the characteristics of rainfall from satellite data TRMM JAXA (Tropical Rainfall Measuring Mission) in the Jakarta area and its surroundings, to know how they were distributed both temporally and spatially. From observations during IOP periods can be seen that the temporal distribution of rainfall high intensity of rain that has occurred during the day (starting at 13.00 pm) until late at night (24.00 pm) with the highest intensity occurred in the period between 13.00 until 18.00. Spatially the highest total of rainfall during the IOP is concentrated in the area around the border between Jakarta (South Jakarta), West Java (Depok), and Banten (South Tangerang City) with total rainfall 600–650 mm. The main supply of the heaviest rainfall was the rain that occurred in the South until the middle part of Jakarta. 

Numerical Studies of Cyclogenesis Events during the Second Intensive Observation Period (IOP-2) of GALE

1990 ◽  
Vol 118 (2) ◽  
pp. 218-233 ◽  
Author(s):  
Chi-Sann Liou ◽  
Carlyle H. Wash ◽  
Stacey M. Heikkinen ◽  
Russell L. Elsberry
Keyword(s):  
Numerical Studies ◽  
Intensive Observation ◽  
Observation Period

scholarly journals Precipitation at Dumont d'Urville, Adélie Land, East Antarctica: the APRES3 field campaigns dataset

2018 ◽  
Vol 10 (3) ◽  
pp. 1605-1612 ◽  
Author(s):  
Christophe Genthon ◽  
Alexis Berne ◽  
Jacopo Grazioli ◽  
Claudio Durán Alarcón ◽  
Christophe Praz ◽  
...  
Keyword(s):  
Climate Models ◽  
Data Repository ◽  
X Band ◽  
Intensive Observation ◽  
Radar Measurements ◽  
Scientific Results ◽  
Antarctic Precipitation ◽  
Severe Shortage ◽  
Observation Period

Abstract. Compared to the other continents and lands, Antarctica suffers from a severe shortage of in situ observations of precipitation. APRES3 (Antarctic Precipitation, Remote Sensing from Surface and Space) is a program dedicated to improving the observation of Antarctic precipitation, both from the surface and from space, to assess climatologies and evaluate and ameliorate meteorological and climate models. A field measurement campaign was deployed at Dumont d'Urville station at the coast of Adélie Land in Antarctica, with an intensive observation period from November 2015 to February 2016 using X-band and K-band radars, a snow gauge, snowflake cameras and a disdrometer, followed by continuous radar monitoring through 2016 and beyond. Among other results, the observations show that a significant fraction of precipitation sublimates in a dry surface katabatic layer before it reaches and accumulates at the surface, a result derived from profiling radar measurements. While the bulk of the data analyses and scientific results are published in specialized journals, this paper provides a compact description of the dataset now archived in the PANGAEA data repository (https://www.pangaea.de, https://doi.org/10.1594/PANGAEA.883562) and made open to the scientific community to further its exploitation for Antarctic meteorology and climate research purposes.

scholarly journals An empirical method to improve rainfall estimation of dual polarization radar using ground measurements

2016 ◽  
Author(s):  
Jungsoo Yoon ◽  
Mi-Kyung Suk ◽  
Kyung-Yeub Nam ◽  
Jeong-Seok Ko ◽  
Hae-Lim Kim ◽  
...  
Keyword(s):  
Empirical Method ◽  
Dual Polarization ◽  
Rainfall Estimation ◽  
Radar Rainfall ◽  
Rainfall Events ◽  
High Rainfall ◽  
Estimation Algorithms ◽  
Hourly Rainfall ◽  
Constant Altitude ◽  
Position Indicator

Abstract. This study presents an easy and convenient empirical method to optimize polarimetric variables and produce more accurate dual polarization radar rainfall estimation. Weather Radar Center (WRC) in Korea Meteorological Administration (KMA) suggested relations between polarimetric variables (Z–ZDR and Z–KDP) based on a 2-D Video Distrometer (2DVD) measurements in 2014. Observed polarimetric variables from CAPPI (Constant Altitude Plan Position Indicator) images composed at 1 km of height were adjusted using the WRC's relations. Then dual polarization radar rainfalls were estimated by six different radar rainfall estimation algorithms, which are using either Z, Z and ZDR, or Z, ZDR and KDP. Accuracy of radar rainfall estimations derived by the six algorithms using the adjusted variables was assessed through comparison with raingauge observations. As a result, the accuracy of the radar rainfall estimation using adjusted polarimetric variables has improved from 50 % to 70 % approximately. Three high rainfall events with more than 40 mm of maximum hourly rainfall were shown the best accuracy on the rainfall estimation derived by using Z, ZDR and KDP. Meanwhile stratiform event was gained better radar rainfalls estimated by algorithms using Z and ZDR.

scholarly journals The Unconventional Eyewall Replacement Cycle of Hurricane Ophelia (2005)

2021 ◽  
Author(s):  
Muhammad Naufal Razin ◽  
Michael M. Bell
Keyword(s):  
Intensity Change ◽  
Wind Maximum ◽  
Low Level ◽  
Tangential Wind ◽  
Eyewall Replacement Cycle ◽  
Flight Level ◽  
Intensive Observation ◽  
Observation Period ◽  
Replacement Cycle

AbstractHurricane Ophelia (2005) underwent an unconventional eyewall replacement cycle (ERC) as it was a Category 1 storm located over cold sea surface temperatures near 23°C. The ERC was analyzed using airborne radar, flight-level, and dropsonde data collected during the Hurricane Rainband and Intensity Change Experiment (RAINEX) intensive observation period on 11 September 2005. Results showed that the spin-up of the secondary tangential wind maximum during the ERC can be attributed to the efficient convergence of absolute angular momentum by the mid-level inflow of Ophelia’s dominantly stratiform rainbands. This secondary tangential wind maximum strongly contributed to the azimuthal mean tangential wind field, which is conducive for increased low-level supergradient winds and corresponding outflow. The low-level supergradient forcing enhanced convergence to form a secondary eyewall. Ophelia provides a unique example of an ERC occurring in a weaker storm with predominantly stratiform rainbands, suggesting an important role of stratiform precipitation processes in the development of secondary eyewalls.

The variability of evaporation during the HAPEX-Sahel Intensive Observation Period

1997 ◽  
Vol 188-189 ◽  
pp. 385-399 ◽  
Author(s):  
J.H.C. Gash ◽  
P. Kabat ◽  
B.A. Monteny ◽  
M. Amadou ◽  
P. Bessemoulin ◽  
...  
Keyword(s):  
Intensive Observation ◽  
Observation Period

scholarly journals Detecting and Tracking Coastal Precipitation in the Tropics: Methods and Insights into Multiscale Variability of Tropical Precipitation

2020 ◽  
Vol 33 (15) ◽  
pp. 6689-6705
Author(s):  
David Coppin ◽  
Gilles Bellon ◽  
Alexander Pletzer ◽  
Chris Scott
Keyword(s):  
Diurnal Cycle ◽  
Large Scale ◽  
Madden Julian Oscillation ◽  
Maritime Continent ◽  
Total Rainfall ◽  
Tropical Precipitation ◽  
Precipitation Estimates ◽  
Summer Hemisphere ◽  
The Tropics ◽  
Climate Prediction Center

AbstractWe propose an algorithm to detect and track coastal precipitation systems and we apply it to 18 years of the high-resolution (8 km and 30 min) Climate Prediction Center CMORPH precipitation estimates in the tropics. Coastal precipitation in the Maritime Continent and Central America contributes to up to 80% of the total rainfall. It also contributes strongly to the diurnal cycle over land with the largest contribution from systems lasting between 6 and 12 h and contributions from longer-lived systems peaking later in the day. While the diurnal cycle of coastal precipitation is more intense over land in the summer hemisphere, its timing is independent of seasons over both land and ocean because the relative contributions from systems of different lifespans are insensitive to the seasonal cycle. We investigate the hypothesis that coastal precipitation is enhanced prior to the arrival of the Madden–Julian oscillation (MJO) envelope over the Maritime Continent. Our results support this hypothesis and show that, when considering only coastal precipitation, the diurnal cycle appears reinforced even earlier over islands than previously reported. We discuss the respective roles of coastal and large-scale precipitation in the propagation of the MJO over the Maritime Continent. We also document a shift in diurnal cycle with the phases of the MJO, which results from changes in the relative contributions of short-lived versus long-lived coastal systems.

scholarly journals Role of Maritime Continent Convection during the Preconditioning Stage of the Madden-Julian Oscillation Observed in CINDY2011/DYNAMO

2015 ◽  
Vol 93A (0) ◽  
pp. 101-114 ◽  
Author(s):  
Hisayuki KUBOTA ◽  
Kunio YONEYAMA ◽  
Jun-Ichi HAMADA ◽  
Peiming WU ◽  
Agus SUDARYANTO ◽  
...  
Keyword(s):  
Madden Julian Oscillation ◽  
Maritime Continent
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