pertaining to, consisting of, or accomplished in half a day
2.
occurring every 12 hours or twice each day
Word origin
[1585–95; semi- + diurnal]This word is first recorded in the period 1585–95. Other words that entered Englishat around the same time include: develop, filament, keyhole, scuff, titularsemi- is a combining form borrowed from Latin, meaning “half,” freely prefixed to Englishwords of any origin, now sometimes with the senses “partially,” “incompletely,” “somewhat”.Other words that use the affix semi- include: semiautomatic, semidetached, semimonthly, semisophisticated
Examples of 'semidiurnal' in a sentence
semidiurnal
Diurnal and semidiurnal amplitudes and phases show some pronounced year-to-year variations.
J. Fiedler, G. Baumgarten, U. Berger, P. Hoffmann, N. Kaifler, F.-J. Lübken 2011, 'NLC and the background atmosphere above ALOMAR', Atmospheric Chemistry and Physicshttp://www.atmos-chem-phys.net/11/5701/2011/acp-11-5701-2011.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Tides in the region are mostly semidiurnal with tidal prism ranging from 0.4 to 1.5m.
Charles Chizom Dike, Jonah Chukwuma Agunwamba 2012, 'A STUDY ON THE EFFECTS OF TIDE ON SEDIMENTATION IN ESTUARIES OF THE NIGER DELTA, NIGERIA',Journal of Urban and Environmental Engineeringhttp://www.redalyc.org/articulo.oa?id=283224989007. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Thus, the semidiurnal solid tides triggers earthquakes.
Q. H. Xu, L. Chen, J. G. Chen 2012, 'Correlations between solid tides and worldwide earthquakes MS ≥7.0 since 1900', Natural Hazards and Earth System Scienceshttp://www.nat-hazards-earth-syst-sci.net/12/587/2012/nhess-12-587-2012.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Semidiurnal amplitude predictions are generally good for both models.
R. N. Davis, J. Du, A. K. Smith, W. E. Ward, N. J. Mitchell 2013, 'The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and theirinteraction with the stratospheric quasi-biennial oscillation: studies with meteorradar, eCMAM and WACCM', Atmospheric Chemistry and Physicshttp://www.atmos-chem-phys.net/13/9543/2013/acp-13-9543-2013.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
These waves tracked the semidiurnal tide and correspond to the b-waves described by previous authors.
S. R. Ramp, Y. J. Yang, F. L. Bahr 2010, 'Characterizing the nonlinear internal wave climate in the northeastern South ChinaSea', Nonlinear Processes in Geophysicshttp://www.nonlin-processes-geophys.net/17/481/2010/npg-17-481-2010.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The semidiurnal and diurnal variations are mainly related to the ocean tides.
Erhu Wei, Shuanggen Jin, Lihua Wan, Wenjie Liu, Yali Yang, Zhenghong Hu 2015, 'High Frequency Variations of Earth Rotation Parameters from GPS and GLONASS Observations',Sensorshttp://www.mdpi.com/1424-8220/15/2/2944. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
However, the vertical wavelength of the semidiurnal tide showed considerable variations.
M. N. Sasi, K. K. Kumar, M. Antonita, G. Ramkumar, V. Deepa 2006, 'Vertical propagation characteristics and seasonal variability of tidal wind oscillationsin the MLT region over Trivandrum (8.5° N, 77° E): first results from SKiYMETMeteor Radar', Annales Geophysicaehttp://www.ann-geophys.net/24/2877/2006/angeo-24-2877-2006.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Semidiurnal amplitudes are observed to be significantly smaller than diurnal amplitudes.
R. N. Davis, J. Du, A. K. Smith, W. E. Ward, N. J. Mitchell 2013, 'The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and theirinteraction with the stratospheric quasi-biennial oscillation: studies with meteorradar, eCMAM and WACCM', Atmospheric Chemistry and Physicshttp://www.atmos-chem-phys.net/13/9543/2013/acp-13-9543-2013.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The stresses were found to vary regularly with the predominantly semidiurnal tidal flow.
K. A. Korotenko, A. V. Sentchev, F. G. Schmitt 2012, 'Effect of variable winds on current structure and Reynolds stresses in a tidal flow:analysis of experimental data in the eastern English Channel', Ocean Science (OS)http://www.ocean-sci.net/8/1025/2012/os-8-1025-2012.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The observations are analysed to characterise the seasonal and interannual variability of the diurnal and semidiurnal tides.
R. N. Davis, J. Du, A. K. Smith, W. E. Ward, N. J. Mitchell 2013, 'The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and theirinteraction with the stratospheric quasi-biennial oscillation: studies with meteorradar, eCMAM and WACCM', Atmospheric Chemistry and Physicshttp://www.atmos-chem-phys.net/13/9543/2013/acp-13-9543-2013.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)