Ozone content over the Russian Federation in the third quarter of 2016

The review is compiled on the basis of the operation of the total ozone (TO) monitoring system in the CIS and Baltic countries that functions in the operational regime at the Central Aerological Observatory. The monitoring system uses the data from the national network equipped with M-124 filter ozo...

Full description

Saved in:
Bibliographic Details
Published inRussian meteorology and hydrology Vol. 41; no. 11-12; pp. 828 - 831
Main Authors Zvyagintsev, A. M., Ivanova, N. S., Kuznetsova, I. N., Lapchenko, V. A.
Format Journal Article
LanguageEnglish
Published New York Allerton Press 01.11.2016
Springer Nature B.V
Subjects
Online AccessGet full text

Cover

Loading…
Abstract The review is compiled on the basis of the operation of the total ozone (TO) monitoring system in the CIS and Baltic countries that functions in the operational regime at the Central Aerological Observatory. The monitoring system uses the data from the national network equipped with M-124 filter ozonometers under methodological supervision of the Main Geophysical Observatory. The quality of the functioning of the entire system is under the operational control based on the observations obtained from the OMI satellite equipment (NASA, the United States). The basic TO observation data are generalized for each month of the third quarter of 2016 and for the quarter as a whole. The data of routine observations of surface ozone content carried out in the Moscow region and Crimea are also presented.
AbstractList The review is compiled on the basis of the operation of the total ozone (TO) monitoring system in the CIS and Baltic countries that functions in the operational regime at the Central Aerological Observatory. The monitoring system uses the data from the national network equipped with M-124 filter ozonometers under methodological supervision of the Main Geophysical Observatory. The quality of the functioning of the entire system is under the operational control based on the observations obtained from the OMI satellite equipment (NASA, the United States). The basic TO observation data are generalized for each month of the third quarter of 2016 and for the quarter as a whole. The data of routine observations of surface ozone content carried out in the Moscow region and Crimea are also presented.
Author Lapchenko, V. A.
Zvyagintsev, A. M.
Ivanova, N. S.
Kuznetsova, I. N.
Author_xml – sequence: 1
  givenname: A. M.
  surname: Zvyagintsev
  fullname: Zvyagintsev, A. M.
  email: azvyagintsev@cao-rhms.ru
  organization: Central Aerological Observatory
– sequence: 2
  givenname: N. S.
  surname: Ivanova
  fullname: Ivanova, N. S.
  organization: Central Aerological Observatory
– sequence: 3
  givenname: I. N.
  surname: Kuznetsova
  fullname: Kuznetsova, I. N.
  organization: Hydrometeorological Research Center of the Russian Federation
– sequence: 4
  givenname: V. A.
  surname: Lapchenko
  fullname: Lapchenko, V. A.
  organization: Vyazemskii Kara Dag Scientific Station—Nature Reserve of Russian Academy of Sciences
BookMark eNp1kE1LAzEQhoNUsK3-AG8LXrysZpLmY49SrAqFgh_nJdlN7JY2aZOsoL_e1HoQxdMMvM_zMswIDZx3BqFzwFcUML1-AswlFbQCDoCBwBEaQkUnpcQVH-Q9x-U-P0GjGFcYM04mYohmi49cVDTeJeNS4d9MKNLSFI99jJ1yxcy0JqjUeVd07itJyy60xa5XIWXW24Jg4Kfo2Kp1NGffc4xeZrfP0_tyvrh7mN7My4ZiSKVtG2mtIqK1jGlBDBYNIawFXTGsW8YmTGqtW0mVIkoKIbLHmdVANZUU6BhdHnq3we96E1O96WJj1mvljO9jDdmRIKScZPTiF7ryfXD5ukxxRjjDFckUHKgm-BiDsfU2dBsV3mvA9f6z9Z_PZoccnJhZ92rCj-Z_pU91K3n6
ContentType Journal Article
Copyright Allerton Press, Inc. 2016
Russian Meteorology and Hydrology is a copyright of Springer, 2016.
Copyright_xml – notice: Allerton Press, Inc. 2016
– notice: Russian Meteorology and Hydrology is a copyright of Springer, 2016.
DBID AAYXX
CITATION
3V.
7QH
7TG
7UA
7XB
88F
88I
8FK
ABUWG
AFKRA
ATCPS
AZQEC
BENPR
BHPHI
BKSAR
C1K
CCPQU
DWQXO
F1W
GNUQQ
H96
HCIFZ
KL.
L.G
M1Q
M2P
PATMY
PCBAR
PQEST
PQQKQ
PQUKI
PYCSY
Q9U
DOI 10.3103/S1068373916110121
DatabaseName CrossRef
ProQuest Central (Corporate)
Aqualine
Meteorological & Geoastrophysical Abstracts
Water Resources Abstracts
ProQuest Central (purchase pre-March 2016)
Military Database (Alumni Edition)
Science Database (Alumni Edition)
ProQuest Central (Alumni) (purchase pre-March 2016)
ProQuest Central (Alumni)
ProQuest Central
Agricultural & Environmental Science Collection
ProQuest Central Essentials
ProQuest Central
Natural Science Collection
Earth, Atmospheric & Aquatic Science Collection
Environmental Sciences and Pollution Management
ProQuest One Community College
ProQuest Central Korea
ASFA: Aquatic Sciences and Fisheries Abstracts
ProQuest Central Student
Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources
SciTech Premium Collection
Meteorological & Geoastrophysical Abstracts - Academic
Aquatic Science & Fisheries Abstracts (ASFA) Professional
Military Database
ProQuest Science Journals
Environmental Science Database
Earth, Atmospheric & Aquatic Science Database
ProQuest One Academic Eastern Edition (DO NOT USE)
ProQuest One Academic
ProQuest One Academic UKI Edition
Environmental Science Collection
ProQuest Central Basic
DatabaseTitle CrossRef
Aquatic Science & Fisheries Abstracts (ASFA) Professional
ProQuest Central Student
ProQuest Central Essentials
ProQuest Central (Alumni Edition)
SciTech Premium Collection
ProQuest One Community College
ProQuest Military Collection
Water Resources Abstracts
Environmental Sciences and Pollution Management
ProQuest Central
Earth, Atmospheric & Aquatic Science Collection
Meteorological & Geoastrophysical Abstracts
Natural Science Collection
ProQuest Central Korea
Agricultural & Environmental Science Collection
ProQuest Science Journals (Alumni Edition)
ProQuest Central Basic
ProQuest Science Journals
ProQuest One Academic Eastern Edition
Earth, Atmospheric & Aquatic Science Database
ProQuest Military Collection (Alumni Edition)
Aqualine
Environmental Science Collection
Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources
ProQuest One Academic UKI Edition
ASFA: Aquatic Sciences and Fisheries Abstracts
Environmental Science Database
ProQuest One Academic
Meteorological & Geoastrophysical Abstracts - Academic
ProQuest Central (Alumni)
DatabaseTitleList Aquatic Science & Fisheries Abstracts (ASFA) Professional

Aquatic Science & Fisheries Abstracts (ASFA) Professional
Database_xml – sequence: 1
  dbid: BENPR
  name: ProQuest Central
  url: https://www.proquest.com/central
  sourceTypes: Aggregation Database
DeliveryMethod fulltext_linktorsrc
Discipline Meteorology & Climatology
EISSN 1934-8096
EndPage 831
ExternalDocumentID 4312409501
10_3103_S1068373916110121
Genre Feature
GeographicLocations Baltic states
Russia, Moscow
USA
ANE, Baltic Sea
GeographicLocations_xml – name: Baltic states
– name: Russia, Moscow
– name: USA
– name: ANE, Baltic Sea
GroupedDBID -5A
-5G
-BR
-EM
-Y2
-~C
.86
.VR
06D
0R~
0VY
123
1N0
29P
2J2
2JN
2JY
2KG
2KM
2LR
2VQ
2~H
30V
3V.
4.4
408
40D
40E
5VS
67M
6NX
7XC
88I
8CJ
8FE
8FH
8TC
95-
95.
95~
96X
AAAVM
AABHQ
AAFGU
AAHNG
AAIAL
AAJKR
AANZL
AAPBV
AARHV
AARTL
AATNV
AATVU
AAUYE
AAWCG
AAYFA
AAYIU
AAYQN
AAYTO
ABDZT
ABECU
ABFGW
ABFTV
ABHQN
ABJNI
ABJOX
ABKAS
ABKCH
ABMNI
ABMQK
ABNWP
ABQBU
ABSXP
ABTEG
ABTHY
ABTKH
ABTMW
ABULA
ABUWG
ABWNU
ABXPI
ACBMV
ACBRV
ACBXY
ACBYP
ACCUX
ACGFS
ACGOD
ACHSB
ACHXU
ACIGE
ACIPQ
ACKNC
ACMDZ
ACMLO
ACOKC
ACOMO
ACSNA
ACTTH
ACVWB
ACWMK
ADHHG
ADHIR
ADINQ
ADKNI
ADMDM
ADOXG
ADRFC
ADURQ
ADYFF
ADZKW
AEBTG
AEFTE
AEGAL
AEGNC
AEJHL
AEJRE
AEKMD
AENEX
AEOHA
AEPYU
AESTI
AETLH
AEVLU
AEVTX
AEXYK
AFGCZ
AFKRA
AFLOW
AFNRJ
AFQWF
AFRAH
AFWTZ
AFZKB
AGAYW
AGDGC
AGGBP
AGJBK
AGMZJ
AGQMX
AGWIL
AGWZB
AGYKE
AHAVH
AHBYD
AHSBF
AIAKS
AIIXL
AILAN
AIMYW
AITGF
AJBLW
AJDOV
AJRNO
AKQUC
ALMA_UNASSIGNED_HOLDINGS
ALWAN
AMKLP
AMXSW
AMYLF
AMYQR
AOCGG
ARMRJ
ATCPS
AXYYD
AZQEC
B-.
BA0
BDATZ
BENPR
BGNMA
BHPHI
BKSAR
BPHCQ
CAG
CCPQU
COF
CS3
D1J
D1K
DDRTE
DNIVK
DPUIP
DU5
DWQXO
EBLON
EBS
EIOEI
EJD
ESBYG
FERAY
FFXSO
FIGPU
FINBP
FNLPD
FRRFC
FSGXE
FWDCC
GGCAI
GGRSB
GJIRD
GNUQQ
GNWQR
GQ6
GQ7
HCIFZ
HF~
HG6
HLICF
HMJXF
HRMNR
HZ~
IJ-
IKXTQ
IWAJR
I~X
I~Z
J-C
JBSCW
JZLTJ
K6-
KOV
L8X
LK5
LLZTM
M1Q
M2P
M4Y
M7R
MA-
NPVJJ
NQJWS
NU0
O9-
O93
O9J
PATMY
PCBAR
PF0
PQQKQ
PROAC
PT4
PYCSY
Q2X
QOS
R89
R9I
RIG
RNS
ROL
RPX
RSV
S16
S1Z
S27
S3B
SAP
SDH
SEV
SHX
SNE
SNPRN
SNX
SOHCF
SOJ
SPISZ
SRMVM
SSLCW
STPWE
SZN
T13
TSG
TUC
U2A
UG4
UNUBA
UOJIU
UTJUX
UZXMN
VC2
VFIZW
W48
WK8
XU3
YLTOR
ZMTXR
~02
AACDK
AAJBT
AASML
AAYXX
AAYZH
ABAKF
ACAOD
ACDTI
ACZOJ
AEFQL
AEMSY
AFBBN
AGRTI
AIGIU
CITATION
H13
SJYHP
7QH
7TG
7UA
7XB
8FK
C1K
F1W
H96
KL.
L.G
PQEST
PQUKI
Q9U
ID FETCH-LOGICAL-c301t-fdc8ffa27df55b72e07c225d1b950bd55458bbbd83aa2a8777c3065fb13b38313
IEDL.DBID AGYKE
ISSN 1068-3739
IngestDate Thu Oct 24 20:47:24 EDT 2024
Thu Oct 10 20:54:54 EDT 2024
Sat Oct 19 02:16:15 EDT 2024
Sat Dec 16 12:02:55 EST 2023
IsPeerReviewed true
IsScholarly true
Issue 11-12
Keywords Total ozone monitoring in CIS and Baltic
total ozone anomaly in the third quarter of 2016
Language English
LinkModel DirectLink
MergedId FETCHMERGED-LOGICAL-c301t-fdc8ffa27df55b72e07c225d1b950bd55458bbbd83aa2a8777c3065fb13b38313
Notes ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
PQID 1865265092
PQPubID 60271
PageCount 4
ParticipantIDs proquest_miscellaneous_1877817884
proquest_journals_1865265092
crossref_primary_10_3103_S1068373916110121
springer_journals_10_3103_S1068373916110121
PublicationCentury 2000
PublicationDate 2016-11-01
PublicationDateYYYYMMDD 2016-11-01
PublicationDate_xml – month: 11
  year: 2016
  text: 2016-11-01
  day: 01
PublicationDecade 2010
PublicationPlace New York
PublicationPlace_xml – name: New York
– name: Dordrecht
PublicationTitle Russian meteorology and hydrology
PublicationTitleAbbrev Russ. Meteorol. Hydrol
PublicationYear 2016
Publisher Allerton Press
Springer Nature B.V
Publisher_xml – name: Allerton Press
– name: Springer Nature B.V
References Zvyagintsev, Ivanova, Nikiforova (CR3) 2016
Zvyagintsev, Vargin, Peshin (CR1) 2015
CR5
CR8
Zvyagintsev, Ivanova, Kakadzhanova (CR2) 2008
Zvyagintsev, Kuznetsova, Shalygina (CR4) 2016
CR9
Salby, Titova, Deschamps (CR6) 2012
Solomon, Ivy, Kinnison (CR7) 2016
A. M. Zvyagintsev (9879_CR4) 2016
9879_CR5
M. L. Salby (9879_CR6) 2012
9879_CR8
A. M. Zvyagintsev (9879_CR1) 2015
9879_CR9
S. Solomon (9879_CR7) 2016
A. M. Zvyagintsev (9879_CR3) 2016
A. M. Zvyagintsev (9879_CR2) 2008
References_xml – ident: CR9
– ident: CR5
– ident: CR8
– year: 2016
  ident: CR4
  article-title: Causes and Factors of Positive Anomalies of Surface Ozone in the Moscow Region and the South-eastern Coast ofthe Crimea
  publication-title: Optika Atmosfery i Okeana
  contributor:
    fullname: Shalygina
– year: 2012
  ident: CR6
  article-title: Changes of the Antarctic Ozone Hole: Controlling Mechanisms, Seasonal Predictability, and Evolution
  publication-title: J. Geophys. Res.
  contributor:
    fullname: Deschamps
– year: 2016
  ident: CR7
  article-title: Emergence of Healing in the Antarctic Ozone Layer
  publication-title: Science
  contributor:
    fullname: Kinnison
– year: 2015
  ident: CR1
  article-title: Total Ozone Content Variability and Trends during 1979-2014
  publication-title: Optika Atmosfery i Okeana
  contributor:
    fullname: Peshin
– year: 2008
  ident: CR2
  article-title: Ozone Content over the Russian Federation in the Third Quarter of 2008
  publication-title: Meteorol. Gidrol.
  contributor:
    fullname: Kakadzhanova
– year: 2016
  ident: CR3
  article-title: Ozone Content over the Russian Federation in the First Quarter of 2016
  publication-title: Meteorol. Gidrol.
  contributor:
    fullname: Nikiforova
– ident: 9879_CR9
– ident: 9879_CR8
– volume-title: Optika Atmosfery i Okeana
  year: 2016
  ident: 9879_CR4
  contributor:
    fullname: A. M. Zvyagintsev
– volume-title: Meteorol. Gidrol.
  year: 2008
  ident: 9879_CR2
  contributor:
    fullname: A. M. Zvyagintsev
– volume-title: Science
  year: 2016
  ident: 9879_CR7
  contributor:
    fullname: S. Solomon
– ident: 9879_CR5
– volume-title: Optika Atmosfery i Okeana
  year: 2015
  ident: 9879_CR1
  contributor:
    fullname: A. M. Zvyagintsev
– volume-title: Meteorol. Gidrol.
  year: 2016
  ident: 9879_CR3
  contributor:
    fullname: A. M. Zvyagintsev
– volume-title: J. Geophys. Res.
  year: 2012
  ident: 9879_CR6
  contributor:
    fullname: M. L. Salby
SSID ssj0056247
Score 2.046452
SecondaryResourceType review_article
Snippet The review is compiled on the basis of the operation of the total ozone (TO) monitoring system in the CIS and Baltic countries that functions in the...
SourceID proquest
crossref
springer
SourceType Aggregation Database
Publisher
StartPage 828
SubjectTerms Atmospheric Sciences
Earth and Environmental Science
Earth Sciences
Geophysics
Meteorology
Monitoring systems
Ozone
Reviews and Consultations
SummonAdditionalLinks – databaseName: ProQuest Central
  dbid: BENPR
  link: http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwfV1LS8NAEB60vXgRnxitsoJ4UEKzSTebnkRLSxGsUi30FrLZLBYk6fPir3cmD-sDPWY3ZMPMzs5zvwG44ImKE9fXtkDtaLeM59rtyHdsaZTkQhmtdI72OfD7o9b9WIzLgNuiLKuszsT8oNZZTDHyJg98QnJ32u7NdGZT1yjKrpYtNDah7qKn4NSgftcdPA2rsxiVe95iDP2eAEXJaxd5Teqt1XymQRpDm4dArvh3zbQ2N39kSHPF09uB7dJiZLcFi3dhI0n3wHpAYzeb5zFxdsk6bxO0PPOnfeg9vmdpwqgIHTUKoxpNhmYeG64WdGOS9Qg_ImcIm6T5zPJ1MtdsVtR3ssww1Nf-AYx63ZdO3y7bJdgxSunSNjoOjIlcqY0QSrqJI2OUVs1VWzhKC0qRKaV04EWRGxEOYExt443inkI_lXuHUEvx_46ABX7CpRcbT_iyFWlPuUFEKC2EzY60EhZcVaQKpwUqRojeBNE1_EVXCxoVMcNSQBbhmp0WnH9O49amfEWUJtmK3pEy4Oijtyy4rpjw5RN_LXj8_4InsEVULC4UNqC2nK-SU7Qsluqs3D4fr9HHeQ
  priority: 102
  providerName: ProQuest
Title Ozone content over the Russian Federation in the third quarter of 2016
URI https://link.springer.com/article/10.3103/S1068373916110121
https://www.proquest.com/docview/1865265092
https://search.proquest.com/docview/1877817884
Volume 41
hasFullText 1
inHoldings 1
isFullTextHit
isPrint
link http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV3dT9swED8xeOFlH8C0sK4y0rSHoXSxU8fpY1e1IKYV1FGJPUVxHIsKlG5t8tK_fndOAtuAB56iyI5j-3y-O9_dzwAfea6zXETGlygd_b4NhT9Io8BXVisutTXaOLTPaXQ6759dyastEHdHF8VNr_VIuo3amZVB-OUH2i5oTFGeKCdMKrR4dpq8053hyc9v43b_RYHurhWj-j59UPsyH2_kX2l0r2L-5xV1wmbyqk4AXDuMQooxuelVpe5lm4cIjs8Yx2t42eiebFgvljewlRd74H1HtXm5cqfr7BMb3S5Qh3Vv-zA53yyLnFE4O8omRtGeDBVGNqvWlHvJJoRE4UjLFoUrKa8XK8N-15GibGkZSv7oAOaT8eXo1G8uXvAz5PfStyaLrU2FMlZKrUQeqAz53nA9kIE2kpxtWmsTh2kqUkIUzOgCeqt5qNHi5eFb2C6wf--AxVHOVZjZUEaqn5pQizglvBdCecfhSw8-twRIftX4GgnaJTRVyYOp8qDTkihpWG2d8DgiiP9gIDw4uitGJiHPR1rky4rqKBVztPb7Hhy3ZPmriad-ePis2u9hlya1zlTswHa5qvIPqLKUutusUXx-HU8vZl14MRfDP9ym4DM
link.rule.ids 315,783,787,21400,27936,27937,33756,33757,41093,41535,42162,42604,43817,52123,52246
linkProvider Springer Nature
linkToHtml http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwfV1ZS8NAEB60fdAX8cRo1RXEByXYHJtNnkSlpR6tUhV8C9lsFguS9Hzx1zuTw3qgj9kN2TCzs3PuNwBHViLjxPaUyVE7mq52bDOIvKYptBQWl1pJlaN99rzOs3vzwl_KgNukLKuszsT8oFZZTDHyM8v3CMm9Gdjnw5FJXaMou1q20FiEOkFVofNVv2z1HvrVWYzKPW8xhn6Pj6LkBEVek3prnT3SII2hzUMgV9Z3zTQ3N39kSHPF016FldJiZBcFi9dgIUnXweiisZuN85g4O2ZXbwO0PPOnDWjfv2dpwqgIHTUKoxpNhmYe688mdGOStQk_ImcIG6T5zPR1MFZsVNR3skwz1NfeJjy3W09XHbNsl2DGKKVTU6vY1zqyhdKcS2EnTRGjtCpLBrwpFacUmZRS-U4U2RHhAMbUNl5Ly5Hop1rOFtRS_L9tYL6XWMKJtcM94UbKkbYfEUoLYbMjrbgBJxWpwmGBihGiN0F0DX_R1YBGRcywFJBJOGenAYef07i1KV8RpUk2o3eEQKb6vmvAacWEL5_4a8Gd_xc8gKXOU_cuvLvu3e7CMlG0uFzYgNp0PEv20MqYyv1yK30ATuTKcw
linkToPdf http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV1LT8MwDI7QkBAXxFOUZ5AQB1C1plma7jgNqvEaCJi0W9U0jZiEOti6C78eO215c-BYxUpbJ6n91fZnQg5ZptLMD7QrwDq6LcN9t50EniuNkkwoo5W2bJ_9oDdoXQzFsOpzOq2z3euQZFnTgCxNedF81qZpMabHm_cAZABZYdEoQ4IqgD_zYIk45vQN_E79KQbbbjuMobSL4mVY8_cpvhqmD2_zW4DU2p1omSxVDiPtlCu8QuayfJU41-Drjif2lzg9ot2nETie9mqNRDev4zyj1QtRTNGk4OXRu9kUCyZphPQRdj3oKLcjxeNooulLmd5Jx4aCuQ7WySA6e-j23KpbgpvCIS1co9PQmMSX2gihpJ95MoXDqplqC09pgREypZQOeZL4CdIAptg13ijGFcBUxjdII4fn2yQ0DDImeWq4CGQr0Vz5YYIkLUjNDroSDjmuVRU_l6QYMYAJ1Gv8Q68O2amVGVfnYxqzMEBefq_tO-TgfRh2NoYrkjwbz1BGypABRG855KRehE9T_HXDrX9J75OF29MovjrvX26TRdRvWWm4QxrFZJbtgstRqD27rd4A9U3JGA
openUrl ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Ozone+content+over+the+Russian+Federation+in+the+third+quarter+of+2016&rft.jtitle=Russian+meteorology+and+hydrology&rft.au=Zvyagintsev%2C+A+M&rft.au=Ivanova%2C+N+S&rft.au=Kuznetsova%2C+IN&rft.au=Lapchenko%2C+V+A&rft.date=2016-11-01&rft.issn=1068-3739&rft.eissn=1934-8096&rft.volume=41&rft.issue=11-12&rft.spage=828&rft.epage=831&rft_id=info:doi/10.3103%2FS1068373916110121&rft.externalDBID=NO_FULL_TEXT
thumbnail_l http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/lc.gif&issn=1068-3739&client=summon
thumbnail_m http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/mc.gif&issn=1068-3739&client=summon
thumbnail_s http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/sc.gif&issn=1068-3739&client=summon